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. 31, 2022	Dec. 25, 2021
Basic earnings (loss) per share:
Income (loss) from continuing operations	$ (33,415)	$ 5,153
Less: Allocation of earnings to participating securities	0	(200)
Income (loss) from continuing operations available to common shareholders - basic	$ (33,415)	$ 4,953
Basic weighted-average shares outstanding (in shares)	15,121	15,114
Basic earnings (loss) per share - continuing operations (in dollars per share)	$ (2.21)	$ 0.33
Diluted earnings (loss) per share:
Income (loss) from continuing operations available to common shareholders - basic	$ (33,415)	$ 4,953
Add: Undistributed earnings reallocated to unvested shareholders	0	2
Income (loss) from continuing operations available to common shareholders - basic	$ (33,415)	$ 4,955
Basic weighted-average shares outstanding (in shares)	15,121	15,114
Effect of dilutive securities:
Stock options	0	6
Directors' stock performance units	0	130
Diluted weighted-average shares outstanding	15,121	15,250
Diluted earnings (loss) per share - continuing operations (in dollars per share)	$ (2.21)	$ 0.32
Antidilutive securities excluded from computation of earnings per share, amount (in dollars per share)	130	4
Common Class B
Effect of dilutive securities:
Shares outstanding at the beginning (in shares)	944	669