Note 5 - Lease Intangibles - Net Value of Other Intangibles (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Lease intangibles, gross	$ 5,200,728	$ 7,631,488
Accumulated Amortization	(4,559,510)	(5,526,477)
Lease Intangibles, net	641,218	2,105,011
Leases, Acquired-in-Place [Member]
Lease intangibles, gross	3,136,587	4,360,027
Accumulated Amortization	(2,757,530)	(3,283,027)
Lease Intangibles, net	379,057	1,077,000
Leasing Costs [Member]
Lease intangibles, gross	1,730,656	2,937,976
Accumulated Amortization	(1,510,559)	(2,002,711)
Lease Intangibles, net	220,097	935,265
Above Market Lease [Member]
Lease intangibles, gross	333,485	333,485
Accumulated Amortization	(291,421)	(240,739)
Lease Intangibles, net	$ 42,064	$ 92,746