Note 4 - Assets Held for Rent - Assets Held for Rent (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Shippers placed in service	$ 3,171	$ 3,073
Accumulated depreciation	(411)	(174)
Net	2,760	2,899
Shippers and related components in production	1,945	1,023
Total	$ 4,705	$ 3,922