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Note 7 - Share-based Compensation (Tables)
9 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
   
Three Months Ended
   
Nine Months Ended
 
   
September 30,
   
September 30,
 
   
2017
   
2016
   
2017
   
2016
 
Stock-based compensation expense, gross
  $
1,532
    $
1,271
    $
4,305
    $
3,827
 
Income tax benefit at our statutory rate associated with share-based compensation
   
(597
)    
(496
)    
(1,679
)    
(1,493
)
Stock-based compensation expense, net
  $
935
    $
775
    $
2,626
    $
2,334
 
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
   
Nine Months Ended
 
   
September 30, 2017
   
September 30, 2016
 
   
 
 
 
 
Weighted-
   
 
 
 
 
Weighted-
 
   
 
 
 
 
average
   
 
 
 
 
average
 
   
 
 
 
 
Grant Date
   
 
 
 
 
Grant Date
 
   
Number of
   
Fair Value
   
Number of
   
Fair Value
 
   
Shares
   
Per Share
   
Shares
   
Per Share
 
Restricted stock - common:
                               
Outstanding - beginning of period
   
396,033
     
$12.06
     
337,506
     
$9.57  
 
Granted
   
307,943
     
$10.40
     
237,500
     
$12.88
 
Vested
   
(200,291
)    
$11.82
     
(178,973
)    
$8.46  
 
Outstanding - end of period
   
503,685
     
$11.14
     
396,033
     
$12.06
 
                                 
Restricted stock - class A common:
                               
Outstanding - beginning of period
   
415,082
     
$10.15
     
374,693
     
$9.46  
 
Granted
   
275,076
     
$10.84
     
218,612
     
$11.25
 
Vested
   
(227,526
)    
$10.00
     
(178,223
)    
$10.04
 
Outstanding - end of period
   
462,632
     
$10.63
     
415,082
     
$10.15