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Change in accounting principle, Effect of Change on Statements of Cash Flows (Details) - USD ($)
$ 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 Cash Flows [Abstract]                    
Net loss $ 260 $ 528 $ (2,376) $ (4,348) $ (823) $ 901 $ (2,030) $ (2,089) $ (5,936) $ (4,041)
Deferred income tax benefit                 (2,141) (2,121)
Inventories                 $ (4,378) 3,440
Previously Reported [Member]                    
Consolidated Statements of Cash Flows [Abstract]                    
Net loss         (735)         (4,145)
Deferred income tax benefit                   (2,150)
Inventories                   3,573
Effect of Change [Member] | Change in Method of Inventory Valuation to Average Costing [Member]                    
Consolidated Statements of Cash Flows [Abstract]                    
Net loss         $ (88)         104
Deferred income tax benefit                   29
Inventories                   $ (133)