Condensed Consolidated Balance Sheets - Unaudited (Parentheticals) - USD ($) $ in Thousands	Jun. 28, 2015	Dec. 28, 2014
Other Intangible Assets [Member]
Finite-lived intangible assets, accumulated amortization	$ 1,263	$ 1,001
Allowance for doubtful accounts	756	760
Property and equipment, accumulated depreciation	$ 120,724	$ 114,708
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	34,211,598	34,333,858
Common stock, shares outstanding (in shares)	34,211,598	34,333,858
Treasury stock, shares (in shares)	71,950	71,950