Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Dec. 31, 2013	Sep. 28, 2013	Jun. 29, 2013	Mar. 30, 2013
Statement of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 252	$ 275	$ 254	$ 427	$ 489	$ 425	$ 532	$ 409
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01	$ 0.01	$ 0.01	$ 0.01	$ 0.01	$ 0.01	$ 0.01
Common stock, shares authorized	35,000,000	35,000,000	35,000,000	35,000,000	35,000,000	35,000,000	35,000,000	35,000,000
Common stock, shares issued	10,952,268	10,945,806	10,892,133	10,999,632	10,960,054	10,923,469	10,822,180	10,746,950
Treasury stock shares, held in treasury	0			143,300	143,300	143,300	143,300	143,300