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Change in accounting principle, Effect of Change on Statements of Comprehensive Income (Loss) (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 Comprehensive Loss [Abstract]                    
Net loss $ 260 $ 528 $ (2,376) $ (4,348) $ (823) $ 901 $ (2,030) $ (2,089) $ (5,936) $ (4,041)
Comprehensive loss         (750)       $ (6,158) (3,860)
Previously Reported [Member]                    
Consolidated Statements of Comprehensive Loss [Abstract]                    
Net loss         (735)         (4,145)
Comprehensive loss         (662)         (3,964)
Effect of Change [Member] | Change in Method of Inventory Valuation to Average Costing [Member]                    
Consolidated Statements of Comprehensive Loss [Abstract]                    
Net loss         (88)         104
Comprehensive loss         $ (88)         $ 104