Note M - Leases - Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Long-term	$ 147	$ 140	$ 441	$ 412
Short-term	572	527	1,632	1,671
Total	$ 719	$ 667	$ 2,073	$ 2,083