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Note 12 - Segments - Operating Income by Segment (Details) - USD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Rental, fees and other income $ 17,764,281 $ 19,231,109
Property and related expenses (5,841,396) (6,183,189)
General and administrative expenses (6,163,816) (6,225,510)
Depreciation and amortization (5,465,015) (5,397,498)
Interest expense (4,712,487) (4,822,085)
Gain on extinguishment of government debt 0 10,000
Other income (expense), net 2,039,922 (3,417)
Income tax expense (1,215,873) 47,620
Gain on sale of real estate 5,079,912 2,487,528
Net income (loss) 1,485,528 (1,463,442)
Operating Segments [Member]    
Net operating income, as defined 11,922,885 12,439,920
Office/Industrial Properties [Member] | Operating Segments [Member]    
Rental, fees and other income 12,702,986 13,161,268
Property and related expenses (5,148,110) (5,769,843)
Net operating income, as defined 7,554,876 7,391,425
Model Home Properties [Member] | Operating Segments [Member]    
Rental, fees and other income 2,909,871 3,211,149
Property and related expenses (102,660) (129,389)
Net operating income, as defined 2,807,211 3,081,760
Retail Properties [Member] | Operating Segments [Member]    
Rental, fees and other income 2,224,479 3,023,316
Property and related expenses (663,681) (1,056,581)
Net operating income, as defined $ 1,560,798 $ 1,966,735