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Inventories (Details) - USD ($)
Sep. 30, 2023
Dec. 31, 2022
Inventory Disclosure [Abstract]    
Raw materials and manufacturing supplies $ 5,406,000 $ 4,977,000
Finished products 1,374,000 1,964,000
Total inventories 6,780,000 6,941,000
Inventory valuation reserves $ 0 $ 0