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Change in accounting principle, Effect of Change on Statements of Changes in Shareholders' Equity (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Condensed Consolidated Statements of Changes in Shareholders' Equity [Abstract]        
Beginning balance $ 32,672 $ 26,963 $ 38,984 $ 30,125
Net income (loss) 528 901 (6,196) (3,218)
Ending balance 33,282 39,361 33,282 39,361
Retained Earnings [Member]        
Condensed Consolidated Statements of Changes in Shareholders' Equity [Abstract]        
Beginning balance 8,842 15,488 15,566 19,607
Net income (loss) 528 901 (6,196) (3,218)
Ending balance $ 9,370 16,389 $ 9,370 16,389
Previously Reported [Member]        
Condensed Consolidated Statements of Changes in Shareholders' Equity [Abstract]        
Beginning balance   26,873   30,236
Net income (loss)   910   (3,410)
Ending balance   39,280   39,280
Previously Reported [Member] | Retained Earnings [Member]        
Condensed Consolidated Statements of Changes in Shareholders' Equity [Abstract]        
Beginning balance   15,398   19,718
Ending balance   16,308   16,308
Effect of Change [Member] | Change in Method of Inventory Valuation to Average Costing [Member]        
Condensed Consolidated Statements of Changes in Shareholders' Equity [Abstract]        
Beginning balance   90   (111)
Net income (loss)   (9)   192
Ending balance   81   81
Effect of Change [Member] | Retained Earnings [Member] | Change in Method of Inventory Valuation to Average Costing [Member]        
Condensed Consolidated Statements of Changes in Shareholders' Equity [Abstract]        
Beginning balance   90   (111)
Ending balance   $ 81   $ 81