Note D - Fair Values of Financial Instruments - Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Oct. 02, 2021	Dec. 26, 2020	Oct. 03, 2020
Cash and cash equivalents	$ 6,492	$ 3,505	$ 6,811
Current portion of long-term debt	7,143
Long-term debt	51,874	30,073
Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	6,492	3,505	$ 6,811
Fair Value, Inputs, Level 2 [Member]
Current portion of long-term debt	7,143
Long-term debt	$ 51,874	$ 30,073