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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 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 Changes in Shareholders' Equity [Abstract]                    
Beginning balance       $ 38,984 $ 39,361     $ 30,125 $ 38,984 $ 30,125
Net loss $ 260 $ 528 $ (2,376) (4,348) (823) $ 901 $ (2,030) (2,089) (5,936) (4,041)
Ending balance 33,862       38,984 39,361     33,862 38,984
Retained Earnings [Member]                    
Consolidated Statements of Changes in Shareholders' Equity [Abstract]                    
Beginning balance       15,566 16,389     19,607 15,566 19,607
Net loss                 (5,936) (4,041)
Ending balance $ 9,630       15,566 16,389     9,630 15,566
Previously Reported [Member]                    
Consolidated Statements of Changes in Shareholders' Equity [Abstract]                    
Beginning balance       38,991 39,280     30,236 38,991 30,236
Net loss         (735)         (4,145)
Ending balance         38,991 39,280       38,991
Previously Reported [Member] | Retained Earnings [Member]                    
Consolidated Statements of Changes in Shareholders' Equity [Abstract]                    
Beginning balance       15,573 16,308     19,718 15,573 19,718
Ending balance         15,573 16,308       15,573
Effect of Change [Member] | Change in Method of Inventory Valuation to Average Costing [Member]                    
Consolidated Statements of Changes in Shareholders' Equity [Abstract]                    
Beginning balance       (7) 81     (111) (7) (111)
Net loss         (88)         104
Ending balance         (7) 81       (7)
Effect of Change [Member] | Retained Earnings [Member] | Change in Method of Inventory Valuation to Average Costing [Member]                    
Consolidated Statements of Changes in Shareholders' Equity [Abstract]                    
Beginning balance       $ (7) 81     $ (111) $ (7) (111)
Ending balance         $ (7) $ 81       $ (7)