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Note 4 - Stock-based Compensation (Tables)
3 Months Ended
Apr. 01, 2017
Notes Tables  
Share-based Compensation, Stock Options, Activity [Table Text Block]
   
Options
 
   
Shares
   
Weighted Average Exercise Price
 
Outstanding, December 31, 2016
   
757,784
    $
9.91
 
Granted
   
72,051
     
8.85
 
Exercised
   
769
     
6.21
 
Forfeited
   
23,549
     
13.49
 
Canceled or expired
   
     
 
Outstanding, April 1, 2017
   
805,517
    $
9.71
 
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
   
Restricted Stock
   
Performance Shares
 
   
Shares
   
Weighted Average Grant Date Fair Value
   
Shares
   
Weighted Average Grant Date Fair Value
 
Outstanding, December 31, 2016
   
316,116
    $
13.30
     
241,141
    $
15.39
 
Granted
   
205,878
     
8.85
     
83,897
     
8.85
 
Vested
   
104,795
     
13.01
     
6,473
     
20.54
 
Forfeited
   
18,337
     
13.42
     
15,098
     
14.21
 
Canceled or expired
   
     
     
13,704
     
13.68
 
Outstanding, April 1, 2017
   
398,862
    $
11.07
     
289,763
    $
13.66
 
Share-based Compensation, Performance Shares Award Outstanding Activity [Table Text Block]
   
Performance Shares
 
Earned shares subject to time-based restrictions at actual
   
6,473
 
Unearned shares subject to performance-based restrictions at target:
       
2015 - 2017 consolidated total revenues
   
50,000
 
2016 - 2018 consolidated total revenues
   
149,393
 
2017 - 2019 consolidated pre-tax income
   
83,897
 
Performance shares outstanding, April 1, 2017
   
289,763