(11) Net Income (Loss) Per Share - Basic and Diluted net income (loss) per share calculations (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 26, 2015	Dec. 27, 2014
Basic Computation:
Net income (loss)	$ (453,617)	$ 450,619	$ 1,002,768
Weighted average common shares outstanding	13,201,284	13,180,428	13,096,183
Basic net income (loss) per share	$ (0.03)	$ 0.03	$ 0.08
Diluted Computation:
Net income (loss)	$ (453,617)	$ 450,619	$ 1,002,768
Weighted average common shares outstanding	13,201,284	13,180,428	13,096,183
Stock options		$ 458,646	$ 606,822
Total shares	13,201,284	13,639,074	13,703,005
Diluted net income (loss) per share	$ (0.03)	$ 0.03	$ 0.07