Cover [Abstract] Entity Central Index Key Entity Central Index Key Document Type Document Type Document Annual Report Document Period End Date Document Period End Date Document Transition Report Entity File Number Entity Registrant Name Entity Registrant Name Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Incorporation, State or Country Code Entity Tax Identification Number Entity Address, Address Line One Entity Address, Address Line Two Entity Address, City or Town Entity Address, State or Province Entity Address, Postal Zip Code City Area Code Local Phone Number Title of 12(b) Security Trading Symbol Trading Symbol Security Exchange Name Entity Current Reporting Status Entity Current Reporting Status Entity Interactive Data Current Entity Filer Category Entity Filer Category Entity Small Business Entity Emerging Growth Company Entity Ex Transition Period Entity Shell Company Entity Listing, Par Value Per Share Entity Public Float Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Current Fiscal Year End Date Current Fiscal Year End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Amendment Flag Amendment Flag CONSOLIDATED BALANCE SHEETS Statement [Table] Statement [Line Items] Assets [Abstract] Property, Plant and Equipment, Net [Abstract] Real Estate: Land Land, at cost Buildings and Improvements, Gross Building and Improvements, at cost Property, Plant and Equipment, Gross Total Real Estate, at cost Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Less, Accumulated Depreciation Property, Plant and Equipment, Net Real Estate—Net Cash and Cash Equivalents, at Carrying Value Cash and Cash Equivalents Finite-Lived Intangible Assets, Net Intangible Lease Assets—Net Sub-total Intangible Lease Assets—Net Amount of Straight-Line Rent Adjustment. Straight-Line Rent Adjustment Straight-Line Rent Adjustment Deferred Costs Deferred Expenses Other Assets. Other Assets Total Other Assets Assets Total Assets Liabilities and Equity [Abstract] Liabilities [Abstract] Liabilities: Amount of Accounts Payable, Accrued Expenses and Other Liabilities. Accounts Payable, Accrued Expenses and Other Liabilities Accounts Payable, Accrued Expenses, and Other Liabilities Total Accounts Payable, Accrued Expenses, and Other Liabilities Amount of Prepaid Rent and Deferred Revenue. Prepaid Rent and Deferred Revenue Prepaid Rent and Deferred Revenue Below Market Lease, Net Sub-total Intangible Lease Liabilities —Net Intangible Lease Liabilities—Net Acquired intangible liabilities for the below market lease Long-term Debt. Long-Term Debt Liabilities Total Liabilities Commitments and Contingencies. Commitments and Contingencies Stockholders' Equity Attributable to Parent [Abstract] Equity: Preferred Stock, Value, Issued Preferred Stock, $0.01 par value per share, 100 million shares authorized, no shares issued and outstanding as of December 31, 2020 and December 31, 2019, respectively Common Stock, Value, Issued Common Stock, $0.01 par value per share, 500 million shares authorized, 7,458,755 shares issued and outstanding as of December 31, 2020 and 7,902,737 shares issued and outstanding as of December 31, 2019 Additional Paid in Capital, Common Stock Additional Paid-in Capital Retained Earnings (Accumulated Deficit) Dividends in Excess of Net Income Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated Other Comprehensive Loss Stockholders' Equity Attributable to Parent Stockholders' Equity Stockholders' Equity Attributable to Noncontrolling Interest Noncontrolling Interest Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Balance Balance Total Equity Liabilities and Equity Total Liabilities and Equity Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract] Preferred Stock Preferred Stock, Par or Stated Value Per Share Preferred Stock, par value (in dollars per share) Preferred Stock, Shares Authorized Preferred Stock, shares authorized Preferred Stock, Shares Issued Preferred Stock, shares issued Preferred Stock, Shares Outstanding Preferred Stock, shares outstanding Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] Common Stock Common Stock, Par or Stated Value Per Share Common Stock, par value (in dollars per share) Common Stock, Shares Authorized Common Stock, shares authorized Common Stock, Shares, Issued Common Stock, shares issued Number of shares sold Common Stock, Shares, Outstanding Common Stock, shares outstanding CONSOLIDATED AND COMBINED STATEMENTS OF OPERATIONS Revenues [Abstract] Revenues: Lease Income Lease Income Revenues Total Revenues Cost of Revenue [Abstract] Operating Expenses: Amount of Real Estate Expenses. Real Estate Expenses Real Estate Expenses General and Administrative Expense General and Administrative Expenses Depreciation, Depletion and Amortization Depreciation and Amortization Operating Expenses Total Operating Expenses Gain (Loss) on Disposition of Assets Gain on Disposition of Assets Gain on sale of assets Gain on Disposition of Assets Operating Income (Loss) Net Income from Operations Interest Income (Expense), Nonoperating, Net Interest Expense Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net Income (Loss) Net Income (Loss) Net Income (Loss) Attributable to Noncontrolling Interest Less: Net (Income) Loss Attributable to Noncontrolling Interest Net Income (Loss) Attributable to Parent Net Income (Loss) Attributable to Alpine Income Property Trust, Inc. Net Income (Loss) Attributable to Alpine Income Property Trust, Inc. Earnings Per Share, Basic and Diluted [Abstract] Net Income (loss) Attributable to Alpine Income Property Trust, Inc. Earnings Per Share, Basic Basic (in dollars per share) Earnings Per Share, Diluted Diluted (in dollars per share) Weighted Average Number of Shares Outstanding, Diluted [Abstract] Weighted Average Number of Common Shares: Weighted Average Number of Shares Outstanding, Basic Weighted Average Number of Common Shares Outstanding (in shares) Basic (in shares) Weighted Average Number of Shares Outstanding, Diluted Total Shares Applicable to Diluted Earnings Per Share (in shares) Diluted (in shares) Common Stock, Dividends, Per Share, Declared Dividends on common stock and OP Units declared Dividends Declared and Paid (in dollars per share) CONSOLIDATED AND COMBINED STATEMENTS OF COMPREHENSIVE INCOME Other Comprehensive Income (Loss), Net of Tax [Abstract] Other Comprehensive Income (Loss) Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax, Parent Cash Flow Hedging Derivative - Interest Rate Swap Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Total Other Comprehensive Loss Comprehensive Income (Loss), Net of Tax, Attributable to Parent Total Comprehensive Income (Loss) CONSOLIDATED AND COMBINED STATEMENTS OF STOCKHOLDERS’ EQUITY Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Represents the information pertaining to predecessor equity. Predecessor Equity [Member] Predecessor Equity Common Stock [Member] Common Stock at Par Additional Paid In Capital [Member] Additional Paid-In Capital Retained Earnings [Member] Dividends in Excess of Net Income Parent [Member] Stockholders' Equity Noncontrolling Interest [Member] Noncontrolling Interest Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (decrease) in shareholders' equity Treasury Stock, Value, Acquired, Cost Method Stock Repurchase Stock repurchased amount Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Stock Compensation Expense from Consolidated-Tomoka Land Co. The amount of net transactions with parent. Transactions With Parent Net Transactions with Consolidated-Tomoka Land Co. Proceeds from Issuance Initial Public Offering Proceeds from Initial Public Offering Cash Received from Initial Public Offering Proceeds from Issuance of Private Placement Cash Received from Private Placement Proceeds from Private Placement Value of operating units issued. Operating Units Issued, Value Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs Payment of Initial Public Offering Transaction Costs Payments of Stock Issuance Costs Cash Paid for Initial Public Offering, Shelf Registration and ATM Transaction Costs Payment of Shelf Registration and ATM Transaction Costs Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures Stock Issuance to Directors Dividends, Common Stock, Cash Cash Dividend Other Comprehensive Income (Loss), Net of Tax Other Comprehensive Income (Loss) Common Stock, Dividends, Per Share, Cash Paid Dividends on common stock and OP Units paid Cash Dividends (in dollars per share) CONSOLIDATED AND COMBINED STATEMENTS OF CASH FLOWS Net Cash Provided by (Used in) Operating Activities [Abstract] Cash Flow from Operating Activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities: Depreciation, Depletion and Amortization, Including Discontinued Operations Depreciation, Depletion and Amortization, Including Discontinued Operations Depreciation and Amortization Amortization of Below Market Lease Amortization of Intangible Lease Assets and Liabilities to Lease Income Increase to Income Properties Revenue Amortization of Debt Issuance Costs Amortization of Deferred Loan Costs to Interest Expense Amortization of Loan Costs The amount of amortization of deferred expenses to lease income. Amortization Of Deferred Expenses To Lease Income Amortization of Deferred Expenses to Lease Income Share-based Compensation Non-Cash Compensation Increase (Decrease) in Operating Assets [Abstract] Decrease (Increase) in Assets: Increase (Decrease) in Prepaid Rent Straight-Line Rent Adjustment Amount of increase (decrease) in deferred rent. Increase (Decrease) in Deferred Rent COVID-19 Rent Deferrals, Net Amount of increase (decrease) in deferred expens Increase (Decrease) In Deferred Expense Deferred Expenses Increase (Decrease) in Other Operating Assets Other Assets Increase (Decrease) in Operating Liabilities [Abstract] Increase (Decrease) in Liabilities: Increase (Decrease) in Accounts Payable and Accrued Liabilities Accounts Payable, Accrued Expenses, and Other Liabilities The amount of increase (decrease) in prepaid rent and deferred revenue. Increase (Decrease) in Prepaid Rent And Deferred Revenue Prepaid Rent and Deferred Revenue Net Cash Provided by (Used in) Operating Activities Net Cash Provided By Operating Activities Net Cash Provided by (Used in) Investing Activities [Abstract] Cash Flow from Investing Activities: Payments to Acquire Real Estate Acquisition of Real Estate, Including Capitalized Expenditures Proceeds from Sale of Productive Assets Proceeds from Disposition of Assets Net Cash Provided by (Used in) Investing Activities Net Cash Used In Investing Activities Net Cash Provided by (Used in) Financing Activities [Abstract] Cash Flow from Financing Activities: Proceeds from Lines of Credit Draws on Credit Facility Repayments of Lines of Credit Payments on Credit Facility Payments for Repurchase of Common Stock Repurchase of Common Stock Proceeds from (Payments to) Transactions with Parent Proceeds from (Payments to) Transactions with Parent Net Transactions with CTO Realty Growth, Inc. Payments of Loan Costs Cash Paid for Loan Fees Payments of Ordinary Dividends, Common Stock Dividends Paid Net Cash Provided by (Used in) Financing Activities Net Cash Provided By (Used In) Financing Activities Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect Net Increase (Decrease) in Cash and Cash Equivalents Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Cash and Cash Equivalents, End of Period Cash and Cash Equivalents, Beginning of Period Supplemental Cash Flow Information [Abstract] Supplemental Disclosure of Cash Flow Information Interest Paid, Net Cash Paid for Interest Total Interest Paid Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Supplemental Disclosure of Non-Cash Investing and Financing Activities Unrealized Gain (Loss) on Cash Flow Hedging Instruments Unrealized Loss on Cash Flow Hedge The amount of non cash operating partnership units issued. Non Cash Operating Partnership Units Issued Contribution of OP Units in Exchange for Predecessor Income Properties BUSINESS AND ORGANIZATION Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] BUSINESS AND ORGANIZATION Full disclosure of Basis of Presentation and Principles Of Consolidation BASIS OF PRESENTATION AND PRINCIPLES OF CONSOLIDATION The entire disclosure for basis of presentation and principles of consolidation. Basis of Presentation and Principles of Consolidation [Text Block] BASIS OF PRESENTATION AND PRINCIPLES OF CONSOLIDATION SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Significant Accounting Policies [Text Block] SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES INCOME PROPERTY PORTFOLIO Real Estate Disclosure [Text Block] INCOME PROPERTY PORTFOLIO FAIR VALUE OF FINANCIAL INSTRUMENTS Fair Value Disclosures [Text Block] FAIR VALUE OF FINANCIAL INSTRUMENTS INTANGIBLE ASSETS AND LIABILITIES Intangible Assets Disclosure [Text Block] INTANGIBLE ASSETS AND LIABILITIES OTHER ASSETS Other Assets Disclosure [Text Block] OTHER ASSETS ACCOUNTS PAYABLE, ACCRUED EXPENSES, AND OTHER LIABILITIES Accounts Payable, Accrued Liabilities, and Other Liabilities Disclosure, Noncurrent [Text Block] ACCOUNTS PAYABLE, ACCRUED EXPENSES, AND OTHER LIABILITIES LONG-TERM DEBT Long-term Debt [Text Block] LONG-TERM DEBT INTEREST RATE SWAP Derivative Instruments and Hedging Activities Disclosure [Text Block] INTEREST RATE SWAP EQUITY Stockholders' Equity Note Disclosure [Text Block] EQUITY COMMON STOCK AND EARNINGS PER SHARE Earnings Per Share [Text Block] COMMON STOCK AND EARNINGS PER SHARE SHARE REPURCHASES Treasury Stock [Text Block] SHARE REPURCHASES STOCK-BASED COMPENSATION Disclosure of Compensation Related Costs, Share-based Payments [Text Block] STOCK-BASED COMPENSATION RELATED PARTY MANAGEMENT COMPANY Related Party Transactions Disclosure [Text Block] RELATED PARTY MANAGEMENT COMPANY COMMITMENTS AND CONTINGENCIES Commitments and Contingencies Disclosure [Text Block] COMMITMENTS AND CONTINGENCIES