Note D - Fair Values of Financial Instruments - Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022	Oct. 01, 2022
Cash and cash equivalents	$ 919	$ 3,967	$ 4,000
Current portion of long-term debt	7,143	7,143	7,143
Long-term debt	64,896	87,738	99,568
Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	919	3,967	4,000
Fair Value, Inputs, Level 2 [Member]
Current portion of long-term debt	7,143	7,143	7,143
Long-term debt	$ 64,896	$ 87,738	$ 99,568