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Note 15 - Stockholders' Equity (Tables)
9 Months Ended
Sep. 30, 2014
Stockholders' Equity Note [Abstract]  
Schedule of Stockholders Equity [Table Text Block]
   
Nine Months Ended
September 30,
 
   
2014
 
   
(in thousands)
 
       
Stockholders’ equity as of December 31, 2013
  $ 251,545  
  Net loss
    (8,178 )
  Accumulated other comprehensive loss
    (1,803 )
  Common stock issued through initial public offering
    38,018  
  Common stock issued to employees, net of shares withheld
    (485 )
  Cost related to public offering
    (3,358 )
  Exercise of stock options
    701  
  Nonemployee share-based compensation expense
    728  
  Employee share-based compensation expense
    5,952  
Stockholders’ equity as of September 30, 2014
  $ 283,120  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
   
Three Months Ended
September 30,
   
Nine Months Ended
September 30,
 
   
2014
   
2013
   
2014
   
2013
 
                   
Average volatility
          28.3 %     29.9 %     28.5 %
Risk-free interest rate
          1.2 %     1.7 %     1.2 %
Weighted-average expected life in years
          4.4       5.0       4.4  
Dividend yield rate
   
      0.0 %     0.0 %     0.0 %
Schedule of Stock Options Roll Forward [Table Text Block]
   
Options
   
Weighted-
Average
Exercise
Price
   
Weighted-
Average
Remaining
Contractual
Term (Years)
   
Aggregate
Intrinsic
Value(1)
 
                     
(in thousands)
 
Outstanding as of December 31, 2013
    10,771,755     $ 15.39              
Options granted
    1,661,862       15.04              
Options exercised
    (65,000 )     10.79              
Options cancelled
    (60,198 )     12.11              
Options expired
    (796,988 )     18.86              
Outstanding as of September 30, 2014
    11,511,431     $ 15.14       4.87     $ 1,975  
Exercisable as of September 30, 2014
    5,732,361     $ 17.27       3.60     $ 806  
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
 
2014
 
2013
 
2014
 
2013
 
 
(in thousands, except per share data)
 
Weighted-average grant date fair value
  $     $ 2.50     $ 4.02     $ 2.54  
Intrinsic value of options exercised
    283       4       144       (1 )
Cash received
    130       38       701       51  
Total fair value of the options vested during the year
    3,510       3,203       4,324       4,056  
Schedule of Nonvested Share Activity [Table Text Block]
   
Options
   
Weighted-Average
Grant Date
Fair Value
 
Nonvested as of December 31, 2013
    5,617,554     $ 3.12  
Options granted
    1,661,862       4.02  
Options vested
    (1,440,148 )     3.00  
Options forfeited
    (60,198 )     4.35  
Nonvested as of September 30, 2014
    5,779,070       3.39  
Schedule of Share-based Compensation, Activity [Table Text Block]
   
Total DSUs Issued
   
Total Fair Market
Value of DSUs
Issued
as Compensation (1)
 
         
(in thousands)
 
DSUs outstanding at December 31, 2013
    98,495        
    DSUs granted
    449,544     $ 6,389  
    DSUs forfeited
    (994 )        
    Common stock delivered
    (9,497 )        
    DSUs surrendered for taxes
    (7,774 )        
DSUs outstanding at September 30, 2014
    529,774