Earnings (Loss) Per Share (Earnings (Loss) Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 26, 2021	Jun. 27, 2020	Jun. 26, 2021	Jun. 27, 2020
Basic earnings (loss) per share:
Income (loss) from continuing operations		$ 3,410	$ (6,979)	$ 1,442	$ (9,592)
Less: Allocation of earnings to participating securities		(144)	0	(50)	0
Income (loss) from continuing operations available to common shareholders - basic		$ 3,266	$ (6,979)	$ 1,392	$ (9,592)
Basic weighted-average shares outstanding (1)	[1]	15,119	15,331	15,102	15,344
Basic earnings (loss) per share - continuing operations		$ 0.22	$ (0.46)	$ 0.09	$ (0.63)
Diluted earnings (loss) per share:
Income (loss) from continuing operations available to common shareholders - basic		$ 3,266	$ (6,979)	$ 1,392	$ (9,592)
Add: Undistributed earnings reallocated to unvested shareholders		1	0	1	0
Income (loss ) from continuing operations available to common shareholders - basic		$ 3,267	$ (6,979)	$ 1,393	$ (9,592)
Effect of dilutive securities:
Stock options (2)	[2]	0	0	0	0
Directors' stock performance units (2)	[2]	130	0	130	0
Diluted weighted-average shares outstanding (1)(2)	[1],[2]	15,249	15,331	15,232	15,344
Diluted earnings (loss) per share - continuing operations		$ 0.21	$ (0.46)	$ 0.09	$ (0.63)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number		681	480	681	480
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		151	296	151	296

[1] Includes Common and Class B Common shares, excluding unvested participating securities of 681 thousand as of June 26, 2021 and 480 thousand as of June 27, 2020.

[2] Shares issuable under stock option plans where the exercise price is greater than the average market price of the Company's Common Stock during the relevant period and directors' stock performance units have been excluded to the extent they are anti-dilutive. Aggregate shares excluded for the three and six months ended June 26, 2021 were 151 thousand and for the three and six months ended June 27, 2020 were 296 thousand.