Note D - Fair Values of Financial Instruments - Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 19, 2022	Dec. 25, 2021	Mar. 20, 2021
Cash and cash equivalents	$ 6,392	$ 4,374	$ 5,879
Current portion of long-term debt	7,143	7,143
Long-term debt	92,850	50,396	46,907
Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	6,392	4,374	5,879
Fair Value, Inputs, Level 2 [Member]
Current portion of long-term debt	7,143	7,143
Long-term debt	$ 92,850	$ 50,396	$ 46,907