Note 4 - Assets Held for Rent - Assets Held for Rent (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Shippers placed in service	$ 5,645	$ 3,171
Fixed assets held for rent	4,040	0
Accumulated depreciation	(2,272)	(411)
Net	7,413	2,760
Shippers and related components in production	2,396	1,945
Total	$ 9,809	$ 4,705