CONSOLIDATED CONDENSED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Jul. 14, 2018	Dec. 30, 2017	Jul. 15, 2017
Receivables allowance (in dollars)	$ 534	$ 623	$ 532
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	14,439,724	14,371,586	14,364,586
Common stock, shares outstanding	14,439,724	14,371,586	14,364,586