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Note 13 - Segments - Net Operating Income (Details) - USD ($)
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Rental revenue $ 3,589,511 $ 3,990,857
Recovery revenue 442,918 648,869
Other operating revenue 92,755 150,335
Total revenue 4,125,184 4,790,061
Rental operating costs 1,612,642 1,563,577
Net Operating Income (NOI) 2,512,542 3,226,484
Gain on Sale - Model Homes 200,000  
Impairment of Model Homes (26,943) (100,000)
Adjusted NOI 2,726,498 5,149,031
Operating Segments [Member] | Retail Properties [Member]    
Rental revenue 206,439 382,885
Recovery revenue 56,439 107,930
Other operating revenue 400 62,574
Total revenue 263,278 553,389
Rental operating costs 100,568 139,954
Net Operating Income (NOI) 162,710 413,435
Adjusted NOI 162,710 413,435
Operating Segments [Member] | Office/Industrial Properties [Member]    
Rental revenue 2,467,551 2,364,141
Recovery revenue 386,479 540,939
Other operating revenue 62,362 56,440
Total revenue 2,916,392 2,961,520
Rental operating costs 1,618,365 1,545,563
Net Operating Income (NOI) 1,298,027 1,415,957
Adjusted NOI 1,298,027 1,415,957
Operating Segments [Member] | Model Home Properties [Member]    
Rental revenue 915,521 1,243,831
Recovery revenue 0 0
Other operating revenue (1,754) 25,120
Total revenue 913,767 1,268,951
Rental operating costs 48,157 41,230
Net Operating Income (NOI) 865,610 1,227,721
Gain on Sale - Model Homes 240,899 2,018,095
Impairment of Model Homes (26,943) (95,548)
Adjusted NOI 1,079,566 3,150,268
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]    
Rental revenue 0 0
Recovery revenue 0 0
Other operating revenue 31,747 6,201
Total revenue 31,747 6,201
Rental operating costs (154,448) (163,170)
Net Operating Income (NOI) 186,195 169,371
Adjusted NOI $ 186,195 $ 169,371