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. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Basic earnings (loss) per share:
Income (loss) from continuing operations		$ 906	$ (2,577)	$ (8,687)	$ (10,399)
Less: Allocation of earnings to participating securities		(27)	0	0	0
Loss from continuing operations available to common shareholders - basic		$ 879	$ (2,577)	$ (8,687)	$ (10,399)
Basic weighted-average shares outstanding (1)	[1]	15,334	15,899	15,340	15,864
Basic earnings (loss) per share - continuing operations		$ 0.06	$ (0.16)	$ (0.57)	$ (0.66)
Diluted earnings (loss) per share:
Loss from continuing operations available to common shareholders - basic		$ 879	$ (2,577)	$ (8,687)	$ (10,399)
Add: Undistributed earnings reallocated to unvested shareholders		0	0	0	0
Loss from continuing operations available to common shareholders - basic		$ 879	$ (2,577)	$ (8,687)	$ (10,399)
Effect of dilutive securities:
Stock options (2)	[2]	0	0	0	0
Directors' stock performance units (2)	[2]	120	0	0	0
Diluted weighted-average shares outstanding (1)(2)	[1],[2]	15,454	15,899	15,340	15,864
Diluted earnings (loss) per share - continuing operations		$ 0.06	$ (0.16)	$ (0.57)	$ (0.66)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number		480	461	480	461
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		166	364		364

[1] Includes Common and Class B Common shares, excluding unvested participating securities of 480 thousand as of September 26, 2020 and 461 thousand as of September 28, 2019.

[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 26, 2020 were 166 thousand and 296 thousand, respectively, and for the three and nine months ended September 28, 2019 were 364 thousand.