Note B - Inventories (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
LIFO Inventory Amount	$ 32,994,000	$ 35,804,000
Excess of Replacement or Current Costs over Stated LIFO Value	9,249,000	14,174,000
Effect of LIFO Inventory Liquidation on Income	2,810,000	0	$ 2,215,000
FIFO Inventory Amount	119,144,000	108,057,000
Inventory, Finished Goods, Gross	3,255,000	4,820,000
Inventory, Work in Process, Gross	105,564,000	92,437,000
Inventory, Raw Materials and Supplies, Gross, Total	$ 10,324,000	$ 10,800,000