Note 12 - Summary of Quarterly Results - Quarterly Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						4 Months Ended		12 Months Ended
	Dec. 31, 2022	Oct. 01, 2022	Mar. 19, 2022	Dec. 25, 2021	Oct. 02, 2021	Mar. 20, 2021	Jul. 09, 2022	Jul. 10, 2021	Dec. 31, 2022	Dec. 25, 2021	Dec. 26, 2020
Net Sales	$ 72,136	$ 74,904	$ 72,380	$ 73,444	$ 81,298	$ 59,191	$ 94,337	$ 99,679	$ 313,757	$ 313,612	$ 273,649
Operating income	4,883	4,220	9,023	6,409	7,672	7,129	8,189	10,686	26,315	31,896	33,032
Net income	$ 2,704	$ 2,958	$ 6,654	$ 4,871	$ 5,966	$ 5,442	$ 5,673	$ 8,126	$ 17,989	$ 24,405	$ 25,934
Basic Earnings Per Share Data: (in dollars per share)	$ 0.20	$ 0.22	$ 0.49	$ 0.36	$ 0.44	$ 0.39	$ 0.42	$ 0.59	$ 1.33	$ 1.78	$ 1.84
Diluted Earnings Per Share Data: (in dollars per share)	$ 0.20	$ 0.22	$ 0.49	$ 0.36	$ 0.43	$ 0.39	$ 0.42	$ 0.58	$ 1.31	$ 1.76	$ 1.82