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Note 6 - Stock-based Compensation (Tables)
3 Months Ended
Apr. 01, 2018
Notes Tables  
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]
   
Restricted
Shares
   
Weighted Average
Grant Date
Fair Value
 
Outstanding at December 31, 2017
   
463,000
    $
17.79
 
Granted
   
192,000
     
25.60
 
Vested
   
48,000
     
17.29
 
Forfeited or canceled
   
5,000
     
17.57
 
Outstanding at April 1, 2018
   
602,000
    $
23.30
 
Schedule of Nonvested Performance-based Units Activity [Table Text Block]
   
Shares
   
Weighted Average
Grant Date
Fair Value
 
Outstanding at December 31, 2017
   
669,500
    $
17.51
 
Granted
   
260,500
     
25.69
 
Vested
   
115,500
     
17.79
 
Forfeited or canceled
   
9,500
     
17.55
 
Outstanding at April 1, 2018
   
805,000
    $
20.12