Earnings (Loss) Per Share (Earnings (Loss) Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 25, 2021	Sep. 26, 2020	Sep. 25, 2021	Sep. 26, 2020
Basic earnings (loss) per share:
Income (loss) from continuing operations		$ 5,597	$ 175	$ 9,102	$ (9,668)
Less: Allocation of earnings to participating securities		(240)	(4)	(341)	0
Income (loss) from continuing operations available to common shareholders - basic		$ 5,357	$ 171	$ 8,761	$ (9,668)
Basic weighted-average shares outstanding (1)	[1]	15,123	15,334	15,109	15,340
Basic earnings (loss) per share - continuing operations		$ 0.35	$ 0.01	$ 0.58	$ (0.63)
Diluted earnings (loss) per share:
Income (loss) from continuing operations available to common shareholders - basic		$ 5,357	$ 171	$ 8,761	$ (9,668)
Add: Undistributed earnings reallocated to unvested shareholders		2	0	2	0
Income (loss ) from continuing operations available to common shareholders - basic		$ 5,359	$ 171	$ 8,763	$ (9,668)
Effect of dilutive securities:
Directors' stock performance units (2)	[2]	130	120	130	0
Diluted weighted-average shares outstanding (1)(2)	[1],[2]	15,253	15,454	15,239	15,340
Diluted earnings (loss) per share - continuing operations		$ 0.35	$ 0.01	$ 0.58	$ (0.63)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number		671	480	671	480
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		177	296	151	296

[1] Includes Common and Class B Common shares, excluding unvested participating securities of 671 thousand as of September 25, 2021 and 480 thousand as of September 26, 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 nine months ended September 25, 2021 were 177 thousand and for the three and nine months ended September 26, 2020 were 166 thousand and 296 thousand, respectively.