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Note 12 - Segments - Operating Income by Segment (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Rental, fees and other income | $ 4,376,179 |  |  | $ 5,663,568 |  |  | $ 14,891,517 | $ 18,814,123
Property and related expenses | (1,414,518) |  |  | (2,108,621) |  |  | (4,739,256) | (6,489,547)
General and administrative expenses | (1,479,261) |  |  | (1,366,380) |  |  | (4,361,297) | (3,996,696)
Depreciation and amortization | (1,306,874) |  |  | (1,626,917) |  |  | (4,104,018) | (4,823,673)
Interest expense | (1,030,883) |  |  | (2,143,960) |  |  | (3,822,313) | (6,971,162)
Gain on extinguishment of government debt | 0 |  |  | 0 |  |  | 10,000 | 0
Other income (expense), net | (13,886) |  |  | (12,270) |  |  | (67,329) | (10,865)
Income tax expense | (182,607) |  |  | (122,602) |  |  | (471,506) | (257,602)
Gain (loss) on sale of real estate | 627,322 |  |  | 332,715 |  |  | 2,060,336 | 656,975
Net loss | (424,528) | $ 1,775,736 | $ (2,255,074) | (1,384,468) | $ (1,607,534) | $ (932,119) | (903,866) | (3,924,121)
Operating Segments [Member] |  |  |  |  |  |  |  |
Net operating income, as defined | 2,961,661 |  |  | 3,554,946 |  |  | 9,852,261 | 11,478,902
Office/Industrial Properties [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |
Rental, fees and other income | 2,888,361 |  |  | 4,098,892 |  |  | 10,149,013 | 13,334,595
Property and related expenses | (1,171,387) |  |  | (1,813,950) |  |  | (4,288,142) | (5,539,320)
Net operating income, as defined | 1,716,974 |  |  | 2,284,942 |  |  | 5,860,871 | 7,795,275
Model Home Properties [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |
Rental, fees and other income | 739,558 |  |  | 1,058,329 |  |  | 2,528,748 | 3,268,074
Property and related expenses | (25,804) |  |  | (58,897) |  |  | (106,304) | (160,688)
Net operating income, as defined | 713,754 |  |  | 999,432 |  |  | 2,422,444 | 3,107,386
Retail Properties [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |
Rental, fees and other income | 748,312 |  |  | 548,392 |  |  | 2,213,808 | 2,305,412
Property and related expenses | (217,379) |  |  | (277,820) |  |  | (644,862) | (1,729,171)
Net operating income, as defined | $ 530,933 |  |  | $ 270,572 |  |  | $ 1,568,946 | $ 576,241

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