Note 4 - Other Assets - Schedule of Other Assets, Net (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Other Assets Unclassified [Abstract]
Prepaid assets and deposits	$ 1,385	$ 1,662
Right-of-use assets, net	1,179	1,287
Straight-line rent receivable	879	885
Pre-acquisition costs	533	519
Receivables due from related parties	210	206
Corporate property, net	101	107
Other receivables, net of allowance of $82 and $82	100	59
Lease incentives	10	12
Interest rate cap asset	3	1
Total	$ 4,400	$ 4,738