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Change in accounting principle, Effect of Change on Statements of Cash Flows (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 Cash Flows [Abstract]        
Net loss $ 528 $ 901 $ (6,196) $ (3,218)
Deferred income taxes     (2,387) (1,520)
Inventories     $ (3,551) 4,677
Previously Reported [Member]        
Condensed Consolidated Statements of Cash Flows [Abstract]        
Net loss   910   (3,410)
Deferred income taxes       (1,573)
Inventories       4,922
Effect of Change [Member] | Change in Method of Inventory Valuation to Average Costing [Member]        
Condensed Consolidated Statements of Cash Flows [Abstract]        
Net loss   $ (9)   192
Deferred income taxes       53
Inventories       $ (245)