Note B - Inventories (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
LIFO Inventory Amount	$ 29,627,000	$ 32,994,000
Excess of Replacement or Current Costs over Stated LIFO Value	9,477,000	9,249,000
Effect of LIFO Inventory Liquidation on Income	3,575,000	2,180,000	$ 0
FIFO Inventory Amount	160,793,000	119,114,000
Inventory, Finished Goods, Gross	2,188,000	3,255,000
Inventory, Work in Process, Gross	144,684,000	105,564,000
Inventory, Raw Materials and Supplies, Gross	$ 13,921,000	$ 10,324,000