Annual report pursuant to Section 13 and 15(d)

Note 12 - Shareholders' Equity (Details Textual)

v3.7.0.1
Note 12 - Shareholders' Equity (Details Textual)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Mar. 07, 2017
USD ($)
$ / shares
Dec. 25, 2016
USD ($)
$ / shares
Sep. 25, 2016
$ / shares
Jun. 26, 2016
$ / shares
Mar. 27, 2016
$ / shares
Dec. 27, 2015
$ / shares
Sep. 27, 2015
$ / shares
Jun. 28, 2015
$ / shares
Mar. 29, 2015
$ / shares
Dec. 25, 2016
USD ($)
$ / shares
shares
Dec. 27, 2015
$ / shares
shares
Dec. 28, 2014
$ / shares
shares
Apr. 30, 2016
USD ($)
Nov. 17, 2014
USD ($)
Common Stock, Number of Voting Rights Per Share                   1        
Stock Repurchased and Retired During Period, Shares | shares                   2,824,322 1,483,085 1,244,065    
Common Stock, Dividends, Per Share, Declared | $ / shares   $ 0.07 $ 0.07 $ 0.07 $ 0.07 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.28 $ 0.24 $ 0.20    
Subsequent Event [Member]                            
Common Stock, Dividends, Per Share, Declared | $ / shares $ 0.09                          
Dividends Payable, Current $ 2.9                          
The 2014 Share Repurchase Plan [Member]                            
Stock Repurchase Program, Authorized Amount                           $ 50.0
Stock Repurchased and Retired During Period, Shares | shares                   731,645        
Stock Repurchased and Retired During Period, Value                   $ 11.7        
Stock Repurchased and Retired During Period, Average Cost per Share | $ / shares                   $ 15.95        
The 2016 Share Repurchase Plan [Member]                            
Stock Repurchase Program, Authorized Amount                         $ 60.0  
Stock Repurchased and Retired During Period, Shares | shares                   2,092,677        
Stock Repurchased and Retired During Period, Value                   $ 33.4        
Stock Repurchased and Retired During Period, Average Cost per Share | $ / shares                   $ 15.97        
Stock Repurchase Program, Remaining Authorized Repurchase Amount   $ 26.6               $ 26.6