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Note 12 - Segments - Operating Income by Segment (Details) - USD ($)
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Rental, fees and other income $ 5,668,754 $ 7,029,151
Property and related expenses (1,838,923) (2,381,092)
General and administrative expenses (1,537,265) (1,351,345)
Depreciation and amortization (1,428,934) (1,574,526)
Interest expense (1,584,394) (2,553,846)
Gain on extinguishment of government debt 10,000 0
Other income (expense), net (32,785) (6,995)
Income tax expense (50,199) (83,631)
Gain (loss) on sale of real estate (1,161,328) (9,835)
Net loss (2,255,074) (932,119)
Operating Segments [Member]    
Net operating income, as defined 3,529,831 4,648,059
Office/Industrial Properties [Member] | Operating Segments [Member]    
Rental, fees and other income 3,942,805 4,984,942
Property and related expenses (1,854,272) (2,015,624)
Net operating income, as defined 2,088,533 2,969,318
Model Home Properties [Member] | Operating Segments [Member]    
Rental, fees and other income 943,777 1,116,730
Property and related expenses (50,285) (46,260)
Net operating income, as defined 893,492 1,070,470
Retail Properties [Member] | Operating Segments [Member]    
Rental, fees and other income 782,172 927,479
Property and related expenses (234,366) (319,208)
Net operating income, as defined $ 547,806 $ 608,271