CONSOLIDATED CONDENSED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 24, 2018	Dec. 30, 2017	Mar. 25, 2017
Receivables allowance (in dollars)	$ 484	$ 623	$ 1,154
Preferred stock, shares authorized	1,000,000	1,000,000	1,000,000
Preferred stock, shares issued	0	0	0
Common Stock, Par or Stated Value Per Share	$ 0	$ 0	$ 0
Common stock, shares authorized	30,000,000	30,000,000	30,000,000
Common stock, shares issued	14,415,690	14,371,586	14,345,528
Common stock, shares outstanding	14,415,690	14,371,586	14,345,528