Note 5 - Deferred Costs and Intangible Assets (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Amortization of Lease Origination Costs and In-place Lease Intangible Assets	$ 73	$ 189	$ 425	$ 572
Write off of Fully Amortized Lease Origination Costs and In-place Leases			669
Amortization of Real Estate Abatements	120	122	360	361
Amortization of Intangible Assets, Total	$ 0	$ 30	30	$ 89
Impairment of Intangible Assets, Finite-lived			444
Gain on Termination of Lease [Member]
Write-off of Origination Costs and Leases Due to Termination			$ 180