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