Earnings (Loss) Per Share (Earnings (Loss) Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended
		Mar. 27, 2021	Mar. 28, 2020
Basic earnings (loss) per share:
Loss from continuing operations		$ (1,967)	$ (2,613)
Less: Allocation of earnings to participating securities		0	0
Loss from continuing operations available to common shareholders - basic		$ (1,967)	$ (2,613)
Basic weighted-average shares outstanding (1)	[1]	15,085	15,356
Basic earnings (loss) per share - continuing operations		$ (0.13)	$ (0.17)
Diluted earnings (loss) per share:
Loss from continuing operations available to common shareholders - basic		$ (1,967)	$ (2,613)
Add: Undistributed earnings reallocated to unvested shareholders		0	0
Loss from continuing operations available to common shareholders - basic		$ (1,967)	$ (2,613)
Effect of dilutive securities:
Stock options (2)	[2]	0	0
Directors' stock performance units (2)	[2]	0	0
Diluted weighted-average shares outstanding (1)(2)	[1],[2]	15,085	15,356
Diluted earnings (loss) per share - continuing operations		$ (0.13)	$ (0.17)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number		641	490
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		281	278

[1] Includes Common and Class B Common shares, excluding unvested participating securities of 641 thousand as of March 27, 2021 and 490 thousand as of March 28, 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 months ended March 27, 2021 were 281 thousand and for the three months ended March 28, 2020 were 278 thousand.