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Note 12 - Segments - Operating Income by Segment (Details) - USD ($) | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Rental, fees and other income | $ 4,573,141 | $ 5,668,754
Property and related expenses | (1,583,473) | (1,838,923)
General and administrative expenses | (1,583,691) | (1,537,265)
Depreciation and amortization | (1,339,225) | (1,428,934)
Interest expense | (1,017,713) | (1,584,394)
Gain on extinguishment of government debt | 0 | 10,000
Other income (expense), net | 73,605 | (32,785)
Income tax expense | (265,239) | (50,199)
Gain (loss) on sale of real estate | 1,522,785 | (1,161,328)
Net income (loss) | 380,190 | (2,255,074)
Operating Segments [Member] |  |
Net operating income, as defined | 2,989,668 | 3,529,831
Office/Industrial Properties [Member] | Operating Segments [Member] |  |
Rental, fees and other income | 3,122,888 | 3,942,805
Property and related expenses | (1,356,534) | (1,854,272)
Net operating income, as defined | 1,766,354 | 2,088,533
Model Home Properties [Member] | Operating Segments [Member] |  |
Rental, fees and other income | 710,328 | 943,777
Property and related expenses | (27,768) | (50,285)
Net operating income, as defined | 682,560 | 893,492
Retail Properties [Member] | Operating Segments [Member] |  |
Rental, fees and other income | 753,341 | 782,172
Property and related expenses | (212,587) | (234,366)
Net operating income, as defined | $ 540,754 | $ 547,806

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