Note 5 - Assets Held for Rent - Assets Held for Rent (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Shippers placed in service	$ 5,433	$ 3,171
Fixed assets held for rent	3,603	0
Accumulated depreciation	(1,284)	(411)
Net	7,752	2,760
Shippers and related components in production	2,334	1,945
Total	$ 10,086	$ 4,705