Note 5 - Lease Intangibles - Net Value of Other Intangibles (Details) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Lease intangibles, gross	$ 4,110,139	$ 5,200,728
Accumulated Amortization	(3,852,968)	(4,559,510)
Lease Intangibles, net	257,171	641,218
Leases, Acquired-in-Place [Member]
Lease intangibles, gross	2,515,264	3,136,587
Accumulated Amortization	(2,353,782)	(2,757,530)
Lease Intangibles, net	161,482	379,057
Leasing Costs [Member]
Lease intangibles, gross	1,261,390	1,730,656
Accumulated Amortization	(1,165,701)	(1,510,559)
Lease Intangibles, net	95,689	220,097
Above Market Lease [Member]
Lease intangibles, gross	333,485	333,485
Accumulated Amortization	(333,485)	(291,421)
Lease Intangibles, net	$ 0	$ 42,064