Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Income Statement [Abstract]
Sales	$ 14,720	$ 23,759
Cost of sales	11,303	18,001
Gross profit	3,417	5,758
Operating expenses	2,047	2,753
Selling, general and administrative expenses	3,606	3,850
Depreciation and amortization expense	317	318
Loss on disposal of assets	0	2
Loss from operations	(2,553)	(1,165)
Other income (expense):
Other income (expense)	(149)	(168)
Interest expense	(46)	(61)
Other income (expense), net	(195)	(229)
Loss before income taxes	(2,748)	(1,394)
Income tax benefit	0	0
Net loss	$ (2,748)	$ (1,394)
Loss per share:
Basic (in dollars per share)	$ (0.21)	$ (0.11)
Diluted (in dollars per share)	$ (0.21)	$ (0.11)
Shares used in per share calculation:
Basic (in shares)	13,273,330	13,071,053
Diluted (in shares)	13,273,330	13,071,053
Revenue from Contract with Customer, Product and Service [Extensible Enumeration]	Product [Member]	Product [Member]