Note 5 - Lease Intangibles - Net Value of Other Intangibles (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Lease intangibles, gross	$ 4,110,139	$ 4,110,139
Accumulated Amortization	(4,072,836)	(4,055,310)
Lease Intangibles, net	37,303	54,829
Leases, Acquired-in-Place [Member]
Lease intangibles, gross	2,515,264	2,515,264
Accumulated Amortization	(2,495,016)	(2,485,234)
Lease Intangibles, net	20,248	30,030
Leasing Costs [Member]
Lease intangibles, gross	1,261,390	1,261,390
Accumulated Amortization	(1,244,335)	(1,236,591)
Lease Intangibles, net	17,055	24,799
Above Market Lease [Member]
Lease intangibles, gross	333,485	333,485
Accumulated Amortization	(333,485)	(333,485)
Lease Intangibles, net	$ 0	$ 0