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. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Basic earnings (loss) per share:
Income (loss) from continuing operations		$ (1,972)	$ 1,226	$ (4,857)	$ 650
Less: Allocation of earnings to participating securities		0	(31)	0	(31)
Income (loss) from continuing operations available to common shareholders - basic		$ (1,972)	$ 1,195	$ (4,857)	$ 619
Basic weighted-average shares outstanding (1)	[1]	15,763	15,707	15,739	15,690
Basic earnings (loss) per share - continuing operations		$ (0.13)	$ 0.08	$ (0.31)	$ 0.04
Diluted earnings (loss) per share:
Income (loss) from continuing operations available to common shareholders - basic		$ (1,972)	$ 1,195	$ (4,857)	$ 619
Add: Undistributed earnings reallocated to unvested shareholders		0	0	0	0
Income (loss) from continuing operations available to common shareholders - basic		$ (1,972)	$ 1,195	$ (4,857)	$ 619
Effect of dilutive securities:
Stock options (2)	[2]	0	0	0	0
Directors' stock performance units (2)	[2]	0	119	0	115
Diluted weighted-average shares outstanding (1)(2)	[1],[2]	15,763	15,826	15,739	15,805
Diluted earnings (loss) per share - continuing operations		$ (0.13)	$ 0.08	$ (0.31)	$ 0.04
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number		675		675
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		426	307	426	307

[1] Includes Common and Class B Common shares, excluding 675 thousand unvested participating securities

[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 30, 2018 were 426 thousand and for the three and six months ended July 1, 2017 were 307 thousand.