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Change in accounting principle, Effect of Change on Balance Sheets (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Consolidated Balance Sheets [Abstract]      
Inventories $ 12,028 $ 7,711  
Deferred tax assets 7,327 5,143  
Retained earnings $ 9,630 15,566 $ 19,607
Previously Reported [Member]      
Consolidated Balance Sheets [Abstract]      
Inventories   7,720  
Deferred tax assets   5,141  
Retained earnings   15,573 $ 19,718
Effect of Change [Member] | Change in Method of Inventory Valuation to Average Costing [Member]      
Consolidated Balance Sheets [Abstract]      
Inventories   (9)  
Deferred tax assets   2  
Retained earnings   $ (7)