Note F - Long-term Debt - Long-term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Total debt	$ 27,100	$ 18,700
Total debt	27,100	18,700
Less: current portion of long-term debt	(6,681)
Long-term debt	20,419	18,700
Texas Capital Credit Facility [Member]
Total debt	17,100	18,700
Total debt	17,100	18,700
Paycheck Protection Program CARES Act [Member]
Total debt	10,000
Total debt	$ 10,000