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Note 5 - Lease Intangibles (Details Textual) - USD ($) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019
Finite-Lived Intangible Assets, Gross, Total | $ 5,321,295 | $ 7,631,488
Finite-Lived Intangible Assets, Accumulated Amortization | 4,562,496 | 5,526,477
Below Market Lease, Net, Ending Balance | $ 187,493 | 309,932
Weighted Average [Member] |  |
Finite-Lived Intangible Assets, Remaining Amortization Period (Year) | 1 year 7 months 6 days |
Real Estate Assets Held for Sale [Member] |  |
Finite-Lived Intangible Assets, Gross, Total | $ 0 | 2,300,000
Finite-Lived Intangible Assets, Accumulated Amortization |  | $ 1,400,000

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