Note 12 - Segment Reporting - Income From Operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment profit	$ (608)	$ (1,189)	$ (574)	$ (268)
Sales, general, and administrative expenses	(992)	(1,247)	(1,997)	(3,009)
Severance and transition costs	0	(139)	0	(139)
Loss on disposals of equipment	(19)	(23)	(70)	(38)
Depreciation and amortization	(1,337)	(1,310)	(2,673)	(2,706)
Loss from operations	$ (2,956)	$ (3,908)	$ (5,314)	$ (6,160)