Organization and Summary of Significant Accounting Policies (Details 4) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2015	Sep. 27, 2014	Sep. 26, 2015	Sep. 27, 2014
Earnings (loss) per common share:
Anti-dilutive options excluded from computation of diluted earnings per share (in shares)		46,652		19,524
Basic Earnings (Loss) Per Share:
Net income (loss)	$ (1,737)	$ 3,084	$ (18,323)	$ 7,153
Weighted average number of common shares	19,594,000	19,530,000	19,580,000	19,478,000
Earnings (loss) per common share (in dollars per share)	$ (0.09)	$ 0.16	$ (0.94)	$ 0.37
Diluted Earnings (Loss) Per Share:
Net income (loss)	$ (1,737)	$ 3,084	$ (18,323)	$ 7,153
Weighted average number of common shares	19,594,000	19,530,000	19,580,000	19,478,000
Incremental shares from assumed conversions of stock options		484,000		488,000
Adjusted weighted average number of common shares	19,594,000	20,014,000	19,580,000	19,966,000
Earnings (loss) per common share (in dollars per share)	$ (0.09)	$ 0.15	$ (0.94)	$ 0.36