Note 11 - Segment Reporting - Income From Operations (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Segment profit	$ 34	$ 921
Sales, general, and administrative expenses	(1,005)	(1,762)
Loss on disposals of equipment	(51)	(15)
Depreciation and amortization	(1,336)	(1,396)
Loss from operations	$ (2,358)	$ (2,252)