Common Stock and Earnings (Loss) Per Share (Earnings (Loss) Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 25, 2021	Dec. 26, 2020
Basic earnings (loss) per share:
Income (loss) from continuing operations	$ 5,153	$ (9,823)
Less: Allocation of earnings to participating securities	(200)	0
Income (loss) from continuing operations available to common shareholders - basic	$ 4,953	$ (9,823)
Basic weighted-average shares outstanding (in shares)	15,114	15,316
Basic earnings (loss) per share - continuing operations (in dollars per share)	$ 0.33	$ (0.64)
Diluted earnings (loss) per share:
Income (loss) from continuing operations available to common shareholders - basic	$ 4,953	$ (9,823)
Add: Undistributed earnings reallocated to unvested shareholders	2	0
Income (loss) from continuing operations available to common shareholders - basic	$ 4,955	$ (9,823)
Effect of dilutive securities:
Stock options	6	0
Directors' stock performance units	130	0
Diluted weighted-average shares outstanding	15,250	15,316
Diluted earnings (loss) per share - continuing operations (in dollars per share)	$ 0.32	$ (0.64)
Antidilutive securities excluded from computation of earnings per share, amount (in dollars per share)	281
Common Class B
Effect of dilutive securities:
Shares outstanding at the beginning (in shares)	669	360