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Note 4 - Inventories (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Inventory, LIFO Reserve $ 95,100 $ 88,200  
Inventory Valuation Reserves 7,900 7,200  
Inventory, LIFO Reserve, Effect on Income, Net $ 6,891 $ 18,041 $ 6,669