Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 30, 2017	Dec. 31, 2016
Receivables allowance (in dollars)	$ 623	$ 910
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	0	0
Common stock, shares authorized	30,000,000	30,000,000
Common stock, shares issued	14,371,586	14,304,959
Common stock, shares outstanding	14,371,586	14,304,959