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Note 6 - Stock-based Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
   
Year Ended December 31,
  
   
2017
    
2016
    
2015
  
Stock-based compensation expense, gross
   $
8,303
     $
5,099
     $
4,019
  
Income tax benefit at our statutory rate associated with stock-based compensation
    
(3,238
 )    
(1,989
 )    
(1,567
 )
Stock-based compensation expense, net
   $
5,065
     $
3,110
     $
2,452
  
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
   
Year Ended December 31,
    
   
2017
    
2016
    
2015
  
     
Number
of
Shares
    
Weighted-
Average
Grant Date
Fair Value
Per Share
      
Number
of
Shares
    
Weighted-
Average
Grant Date
Fair Value
Per Share
      
Number
of
Shares
    
Weighted-
Average
Grant Date
Fair Value
Per Share
 
                                                       
Restricted stock - common:
                                                      
Outstanding - beginning of period
    
396,033
     $
12.06
        
337,506
     $
9.57
        
385,056
     $
9.09
    
Granted
    
307,943
      
10.40
        
237,500
      
12.88
        
150,308
      
10.27
    
Vested
    
(200,291
 )    
11.82
        
(178,973
 )    
8.46
        
(197,858
 )    
9.16
    
Outstanding - end of period
    
503,685
     $
11.14
        
396,033
     $
12.06
        
337,506
     $
9.57
    
                                                       
Restricted stock - Class A common:
                                                      
Outstanding - beginning of period
    
415,082
     $
10.15
        
374,693
     $
9.46
        
204,473
     $
9.81
    
Granted
    
275,076
      
10.84
        
218,612
      
11.25
        
287,513
      
9.37
    
Vested
    
(227,526
 )    
10.00
        
(178,223
 )    
10.04
        
(117,293
 )    
9.85
    
Outstanding - end of period
    
462,632
     $
10.63
        
415,082
     $
10.15
        
374,693
     $
9.46
    
                                                       
Restricted stock units - common:
                                                      
Outstanding - beginning of period
    
-
     $
-
        
 
      
 
        
 
      
 
    
Granted
    
215,500
      
15.70
        
 
      
 
        
 
      
 
    
Vested
    
-
      
-
        
 
      
 
        
 
      
 
    
Forfeited
    
(6,000
 )    
15.70
        
 
      
 
        
 
      
 
    
Outstanding - end of period
    
209,500
     $
15.70