Note C - Accrued Liabilities (Details Textual) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Contract with Customer, Liability, Current	$ 13,666,000	$ 5,660,000
Employee-related Liabilities	8,167,000	7,631,000
Loss Contingency Accrual, Product Liability, Gross	5,065,000	5,407,000
Taxes Payable, Current	330,000	309,000
Accrual for Environmental Loss Contingencies	900,000	921,000
Other Accrued Liabilities, Current	$ 2,441,000	$ 1,640,000