Note 4 - Intangibles - Summary of Carrying Amount of Intangible Assets and Liabilities (Details) - Real Estate [Member] - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Assets:
Above-market leases	$ 4,065	$ 2,661
In-place leases	25,572	17,958
Total net real estate intangible assets	20,192	15,274
Liabilities
Below-market leases	4,273	3,290
Below-market leases accumulated amortization	(1,694)	(909)
Total net real estate intangible liabilities	2,579	2,381
Above-Market Leases [Member]
Assets:
Accumulated amortization	(970)	(504)
Total net real estate intangible assets	3,095
In-Place Leases [Member]
Assets:
Accumulated amortization	(8,475)	$ (4,841)
Total net real estate intangible assets	$ 17,097