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Note 5 - Lease Intangibles (Details Textual) - USD ($) | Sep. 30, 2021 | Dec. 31, 2020
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Finite-Lived Intangible Assets, Gross, Total | $ 4,110,139 | $ 5,200,728
Finite-Lived Intangible Assets, Accumulated Amortization | 3,800,102 | 4,559,510
Below Market Lease, Net, Ending Balance | 86,852 | 139,045
Real Estate Assets Held for Sale [Member] |  |
Finite-Lived Intangible Assets, Gross, Total | 0.0 | 1,100,000
Finite-Lived Intangible Assets, Accumulated Amortization | $ 0.0 | $ 1,100,000

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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