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Note 12 - Segments - Operating Income by Segment (Details) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Rental, fees and other income $ 19,231,109 $ 24,351,792
Property and related expenses (6,183,189) (8,818,283)
General and administrative expenses (6,225,510) (5,751,754)
Depreciation and amortization (5,397,498) (6,274,321)
Interest expense (4,822,085) (8,813,067)
Deferred offering costs 0 (530,639)
Gain on extinguishment of government debt 10,000 451,785
Other income (expense), net (3,417) (20,636)
Income tax expense 47,620 (370,884)
Gain on sale of real estate 2,487,528 1,245,460
Net loss (1,463,442) (6,261,398)
Operating Segments [Member]    
Net operating income, as defined 12,439,920 13,802,658
Office/Industrial Properties [Member] | Operating Segments [Member]    
Rental, fees and other income 13,161,268 17,128,687
Property and related expenses (5,769,843) (7,977,561)
Net operating income, as defined 7,391,425 9,151,126
Model Home Properties [Member] | Operating Segments [Member]    
Rental, fees and other income 3,211,149 4,251,980
Property and related expenses (129,389) (202,667)
Net operating income, as defined 3,081,760 4,049,313
Retail Properties [Member] | Operating Segments [Member]    
Rental, fees and other income 3,023,316 2,971,125
Property and related expenses (1,056,581) (2,368,906)
Net operating income, as defined $ 1,966,735 $ 602,219