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Note 12 - Segments - Operating Income by Segment (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2023
Jun. 30, 2022
Rental, fees and other income $ 4,543,872   $ 4,320,860   $ 8,665,364 $ 8,894,001
Property and related expenses (1,399,159)   (1,348,083)   (2,974,149) (2,931,556)
General and administrative expenses (1,813,184)   (1,214,005)   (3,777,804) (2,797,696)
Depreciation and amortization (1,368,829)   (1,316,193)   (2,702,403) (2,655,418)
Interest expense (1,336,415)   (1,085,860)   (2,204,182) (2,103,573)
Other income (expense), net 398,085   93,128   1,140,201 166,733
Income tax expense (349,074)   (259,285)   (497,527) (524,524)
Gain on sale of real estate 1,119,952   1,227,484   1,537,289 2,750,269
Net income (loss) (204,752) $ (608,459) 418,046 $ 380,190 (813,211) 798,236
Operating Segments [Member]            
Net operating income, as defined 3,144,713   2,972,777   5,691,215 5,962,445
Office/Industrial Properties [Member] | Operating Segments [Member]            
Rental, fees and other income 3,020,066   3,150,251   5,882,064 6,273,139
Property and related expenses (1,202,243)   (1,174,391)   (2,662,932) (2,530,925)
Net operating income, as defined 1,817,823   1,975,860   3,219,132 3,742,214
Model Home Properties [Member] | Operating Segments [Member]            
Rental, fees and other income 1,022,041   696,964   1,877,161 1,407,292
Property and related expenses (46,801)   (25,440)   (77,797) (53,208)
Net operating income, as defined 975,240   671,524   1,799,364 1,354,084
Retail Properties [Member] | Operating Segments [Member]            
Rental, fees and other income 480,001   471,344   938,868 1,224,685
Property and related expenses (128,351)   (145,951)   (266,149) (358,538)
Net operating income, as defined $ 351,650   $ 325,393   $ 672,719 $ 866,147