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Note 12 - Segments - Operating Income by Segment (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2022
Jun. 30, 2021
Rental, fees and other income $ 4,320,860   $ 4,846,583   $ 8,894,001 $ 10,515,337
Property and related expenses (1,348,083)   (1,485,815)   (2,931,556) (3,324,738)
General and administrative expenses (1,214,005)   (1,344,770)   (2,797,696) (2,882,036)
Depreciation and amortization (1,316,193)   (1,368,209)   (2,655,418) (2,797,143)
Interest expense (1,085,860)   (1,207,036)   (2,103,573) (2,791,430)
Gain on extinguishment of government debt 0   0   0 10,000
Other income (expense), net 93,128   (20,657)   166,733 (53,443)
Income tax expense (259,285)   (238,701)   (524,524) (288,899)
Gain (loss) on sale of real estate 1,227,484   2,594,341   2,750,269 1,433,014
Net income (loss) 418,046 $ 380,190 1,775,736 $ (2,255,074) 798,236 (479,338)
Operating Segments [Member]            
Net operating income, as defined 2,972,777   3,360,768   5,962,445 6,890,599
Office/Industrial Properties [Member] | Operating Segments [Member]            
Rental, fees and other income 3,150,251   3,317,847   6,273,139 7,260,652
Property and related expenses (1,174,391)   (1,262,483)   (2,530,925) (3,116,754)
Net operating income, as defined 1,975,860   2,055,364   3,742,214 4,143,898
Model Home Properties [Member] | Operating Segments [Member]            
Rental, fees and other income 696,964   845,412   1,407,292 1,789,190
Property and related expenses (25,440)   (30,215)   (53,208) (80,501)
Net operating income, as defined 671,524   815,197   1,354,084 1,708,689
Retail Properties [Member] | Operating Segments [Member]            
Rental, fees and other income 471,344   683,324   1,224,685 1,465,495
Property and related expenses (145,951)   (193,117)   (358,538) (427,483)
Net operating income, as defined $ 325,393   $ 490,207   $ 866,147 $ 1,038,012