CONSOLIDATED CONDENSED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Oct. 07, 2017	Dec. 31, 2016	Oct. 01, 2016
Receivables allowance (in dollars)	$ 570	$ 910	$ 554
Preferred stock, shares authorized	1,000,000	1,000,000	1,000,000
Preferred stock, shares issued	0	0	0
Common stock, shares authorized	30,000,000	30,000,000	30,000,000
Common stock, shares issued	14,370,586	14,304,959	14,301,959
Common stock, shares outstanding	14,370,586	14,304,959	14,301,959