Note D - Fair Values of Financial Instruments - Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022	Jul. 09, 2022
Cash and cash equivalents	$ 577	$ 3,967	$ 6,195
Current portion of long-term debt	7,143	7,143	7,143
Long-term debt	76,809	87,738	94,040
Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	577	3,967	6,195
Fair Value, Inputs, Level 2 [Member]
Current portion of long-term debt	7,143	7,143	7,143
Long-term debt	$ 76,809	$ 87,738	$ 94,040