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Note 10 - Stock Based Compensation (Details) (USD $)
12 Months Ended 12 Months Ended 120 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Pro Forma [Member]
Dec. 31, 2013
Attainment Level 1 [Member]
Performance RSU [Member]
Dec. 31, 2013
Attainment Level 1 [Member]
Restricted Stock Units (RSUs) [Member]
2013 Stock Incentive Plan [Member]
Dec. 31, 2013
Attainment Level 1 [Member]
Restricted Stock Units (RSUs) [Member]
Dec. 31, 2013
Restricted Stock [Member]
2013 Stock Incentive Plan [Member]
Maximum [Member]
Dec. 31, 2013
Time-vesting RSU [Member]
2013 Stock Incentive Plan [Member]
Dec. 31, 2013
Performance and Time-vesting RSUs [Member]
2013 Stock Incentive Plan [Member]
Dec. 31, 2013
Performance and Time-vesting RSUs [Member]
2013 Stock Incentive Plan [Member]
Minimum [Member]
Dec. 31, 2013
Performance and Time-vesting RSUs [Member]
Dec. 31, 2013
Performance and Time-vesting RSUs [Member]
Maximum [Member]
Dec. 31, 2013
Performance and Time-vesting RSUs [Member]
Minimum [Member]
Dec. 31, 2013
Performance RSU [Member]
2013 Stock Incentive Plan [Member]
Dec. 31, 2013
Restricted Stock Units (RSUs) [Member]
Dec. 31, 2013
Employee Stock Option [Member]
2013 Stock Incentive Plan [Member]
Dec. 31, 2013
Employee Stock Option [Member]
2013 Stock Incentive Plan [Member]
Dec. 31, 2013
Employee Stock Option [Member]
2013 Stock Incentive Plan [Member]
Maximum [Member]
Dec. 31, 2013
Employee Stock Option [Member]
Dec. 31, 2013
2009 ESPP [Member]
Net of Discount [Member]
Dec. 31, 2013
2009 ESPP [Member]
Per Share Discount [Member]
Dec. 31, 2012
2009 ESPP [Member]
Per Share Discount [Member]
Dec. 31, 2011
2009 ESPP [Member]
Per Share Discount [Member]
Dec. 31, 2013
2009 ESPP [Member]
Dec. 31, 2013
2013 Stock Incentive Plan [Member]
Note 10 - Stock Based Compensation (Details) [Line Items]                                                    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized                                                 1,500,000 3,800,000
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Rate                                                 10.00%  
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Amount of Stock per Employee (in Dollars)                                                 $ 25,000  
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent                                                 85.00%  
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period                                                 77,005  
Share-based Compensation Arrangement by Share-based Payment Award, Per Share Weighted Average Price of Shares Purchased (in Dollars per share)                                         $ 49.94 $ 8.81 $ 4.29 $ 2.56    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant                                                 604,288 1,573,080
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date                                                 15.00%  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period               6 years     4 years               5 years              
Stock Issued During Period, Shares, Restricted Stock Award, Gross                 77,736 52,820         108,768                      
Attainment Level         33.00% 33.00%       100.00%     100.00% 30.00%                        
Earnings Per Share, Diluted (in Dollars per share) $ 4.05 $ 3.07 $ 2.21 $ 4.02                                            
Estimated Allocated Share Based Compensation Expense (in Dollars)                       2,200,000       4,700,000                    
Allocated Share-based Compensation Expense (in Dollars) 6,600,000 3,100,000 2,300,000                 500,000       2,400,000                    
Share-based Compensation Arrangement by Share-based Payment Award,Attainment Level of Earnings per Share (in Dollars per share)         $ 4.00   $ 4.00           $ 3.53 $ 0.01                        
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period                                 10 years 6 years                
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options (in Dollars)                                       $ 9,200,000            
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition                                       1 year 328 days