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Inventories (Details) - USD ($)
Sep. 30, 2025
Dec. 31, 2024
Inventory Disclosure [Abstract]    
Raw materials and manufacturing supplies $ 7,683,000 $ 6,113,000
Finished products 1,873,000 2,009,000
Total inventories 9,556,000 8,122,000
Inventory valuation reserves $ 0 $ 0