(5) Share-Based Compensation Plans - Annualized weighted average values of the significant assumptions used to estimate the fair values of options granted during 2017 and 2016 (Details) - $ / shares	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016
Retirement Benefits [Abstract]
Risk-free interest rate low	2.08%	1.39%
Risk-free interest rate high	2.30%	1.53%
Expected life in years	6 years	6 years
Expected volatility	54.00%	53.00%
Expected dividend yield	$ 0	$ 0
Weighted average fair value of grants	$ .84	$ .85