Note 5 - Lease Intangibles - Net Value of Other Intangibles (Details) - USD ($)	Sep. 30, 2024	Dec. 31, 2023
Lease intangibles, gross	$ 3,776,654	$ 4,110,139
Accumulated Amortization	(3,752,496)	(4,072,836)
Lease Intangibles, net	24,158	37,303
Leases, Acquired-in-Place [Member]
Lease intangibles, gross	2,515,264	2,515,264
Accumulated Amortization	(2,502,353)	(2,495,016)
Lease Intangibles, net	12,911	20,248
Leasing Costs [Member]
Lease intangibles, gross	1,261,390	1,261,390
Accumulated Amortization	(1,250,143)	(1,244,335)
Lease Intangibles, net	11,247	17,055
Above Market Lease [Member]
Lease intangibles, gross	0	333,485
Accumulated Amortization	0	(333,485)
Lease Intangibles, net	$ 0	$ 0