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Change in accounting principle, Effect of Change on Statements of Operations (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Consolidated Statements of Operations [Abstract]                    
Cost of sales         $ 6,817       $ 33,727 $ 24,004
Gross profit $ 8,219 $ 8,193 $ 5,434 $ 2,566 4,306 $ 4,305 $ 3,432 $ 3,339 24,412 15,382
Operating loss         (2,597)       (7,677) (9,377)
Loss before income taxes         (1,236)       (7,901) (6,083)
Income tax benefit         413       1,965 2,042
Net loss $ 260 $ 528 $ (2,376) $ (4,348) $ (823) $ 901 $ (2,030) $ (2,089) $ (5,936) $ (4,041)
Net (loss) income per common share [Abstract]                    
Basic (in dollars per share) $ 0.03 $ 0.05 $ (0.24) $ (0.44) $ (0.08) $ 0.1 $ (0.23) $ (0.23) $ (0.6) $ (0.43)
Diluted (in dollars per share) $ 0.03 $ 0.05 $ (0.24) $ (0.44) $ (0.08) $ 0.09 $ (0.23) $ (0.23) $ (0.6) $ (0.43)
Shares used in per-share calculation [Abstract]                    
Basic (in shares)         9,848       9,905 9,298
Diluted (in shares)         9,848       9,905 9,298
Previously Reported [Member]                    
Consolidated Statements of Operations [Abstract]                    
Cost of sales         $ 6,705         $ 24,137
Gross profit         4,418         15,249
Operating loss         (2,485)         (9,510)
Loss before income taxes         (1,124)         (6,216)
Income tax benefit         389         2,071
Net loss         $ (735)         $ (4,145)
Net (loss) income per common share [Abstract]                    
Basic (in dollars per share)         $ (0.07)         $ (0.45)
Diluted (in dollars per share)         $ (0.07)         $ (0.45)
Shares used in per-share calculation [Abstract]                    
Basic (in shares)         9,848         9,298
Diluted (in shares)         9,848         9,298
Effect of Change [Member] | Change in Method of Inventory Valuation to Average Costing [Member]                    
Consolidated Statements of Operations [Abstract]                    
Cost of sales         $ 112         $ (133)
Gross profit         (112)         133
Operating loss         (112)         133
Loss before income taxes         (112)         133
Income tax benefit         24         (29)
Net loss         $ (88)         $ 104
Net (loss) income per common share [Abstract]                    
Basic (in dollars per share)         $ (0.01)         $ 0.02
Diluted (in dollars per share)         $ (0.01)         $ 0.02