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Note 13 - Segments - Net Operating Income (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Rental revenue $ 3,501,644 $ 3,970,176 $ 10,656,987 $ 11,868,386
Recovery revenue 607,222 670,640 1,766,061 1,886,354
Other operating revenue 87,276 82,558 277,018 345,236
Total revenue 4,196,142 4,723,374 12,700,066 14,099,976
Rental operating costs 1,534,563 1,598,015 4,609,810 4,654,087
Net Operating Income (NOI) 2,661,579 3,125,359 8,090,256 9,445,889
Gain on Sale - Model Homes   361,151    
Adjusted NOI 2,598,351 3,444,854 8,473,575 12,398,589
Operating Segments [Member] | Retail Properties [Member]        
Rental revenue 93,574 399,425 393,587 1,173,121
Recovery revenue 0 111,890 56,439 304,261
Other operating revenue 0 600 400 63,774
Total revenue 93,574 511,915 450,426 1,541,156
Rental operating costs 4,828 140,820 110,219 437,415
Net Operating Income (NOI) 88,746 371,095 340,207 1,103,741
Adjusted NOI 88,746 371,095 340,207 1,103,741
Operating Segments [Member] | Office/Industrial Properties [Member]        
Rental revenue 2,372,147 2,563,160 7,292,655 7,336,211
Recovery revenue 607,222 558,750 1,709,622 1,582,093
Other operating revenue 64,450 64,145 191,705 180,287
Total revenue 3,043,819 3,186,055 9,193,982 9,098,591
Rental operating costs 1,627,174 1,588,099 4,795,036 4,596,133
Net Operating Income (NOI) 1,416,645 1,597,956 4,398,946 4,502,458
Adjusted NOI 1,416,645 1,597,956 4,398,946 4,502,458
Operating Segments [Member] | Model Home Properties [Member]        
Rental revenue 1,035,923 1,007,591 2,970,745 3,359,054
Recovery revenue 0 0 0 0
Other operating revenue 7,103 (4,758) 5,776 68,147
Total revenue 1,043,026 1,002,833 2,976,521 3,427,201
Rental operating costs 48,743 38,215 146,840 121,151
Net Operating Income (NOI) 994,283 964,618 2,829,681 3,306,050
Gain on Sale - Model Homes 19,685   583,944 3,191,149
Impairment of Model Homes (82,913) (41,656) (200,625) (238,449)
Adjusted NOI 931,055 1,284,113 3,213,000 6,258,750
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]        
Rental revenue 0 0 0 0
Recovery revenue 0 0 0 0
Other operating revenue 15,723 22,571 79,137 33,028
Total revenue 15,723 22,571 79,137 33,028
Rental operating costs (146,182) (169,119) (442,285) (500,612)
Net Operating Income (NOI) 161,905 191,690 521,422 533,640
Adjusted NOI $ 161,905 $ 191,690 $ 521,422 $ 533,640