Note D - Fair Values of Financial Instruments - Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Mar. 19, 2022
Cash and cash equivalents	$ 6,064	$ 3,967	$ 6,392
Current portion of long-term debt	7,143	7,143	7,143
Long-term debt	88,082	87,738	92,850
Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	6,064	3,967	6,392
Current portion of long-term debt	0	0	0
Long-term debt	0	0	0
Fair Value, Inputs, Level 2 [Member]
Cash and cash equivalents	0	0	0
Current portion of long-term debt	7,143	7,143	7,143
Long-term debt	88,082	87,738	92,850
Fair Value, Inputs, Level 3 [Member]
Cash and cash equivalents	0	0	0
Current portion of long-term debt	0	0	0
Long-term debt	$ 0	$ 0	$ 0