Note 5 - Shareholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended		6 Months Ended
	Jul. 31, 2015	Jun. 28, 2015	Jun. 29, 2014	Jun. 28, 2015	Jun. 29, 2014	Nov. 17, 2014	May. 31, 2013
Subsequent Event [Member]
Common Stock, Dividends, Per Share, Declared	$ 0.06
Dividends Payable, Current	$ 2.1
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number		908,272		908,272
Stock Repurchase Program, Authorized Amount						$ 50.0	$ 30.0
Stock Repurchased During Period, Shares				350,749	541,190
Treasury Stock, Value, Acquired, Cost Method				$ 5.3	$ 6.7
Treasury Stock Acquired, Average Cost Per Share				$ 14.99	$ 12.45
Stock Repurchase Program, Remaining Authorized Repurchase Amount		$ 39.6		$ 39.6
Common Stock, Dividends, Per Share, Declared		$ 0.06	$ 0.05	$ 0.12	$ 0.10