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Note 14 - Share-based Compensation (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Nov. 30, 2015
Aug. 31, 2015
Nov. 30, 2014
Nov. 30, 2015
Nov. 30, 2014
Oct. 31, 2015
Restricted Stock Units (RSUs) [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       2 years    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage       50.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   34,566        
Performance Shares [Member] | Minimum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       3 years    
Performance Shares [Member] | Maximum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       4 years    
Performance Shares [Member] | 2011 Equity Incentive Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value       $ 23.82    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 100,000     $ 100,000    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition       255 days    
Performance Shares [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 6,538     6,538    
Service-based Options and Performance-based Option [Member] | 2011 Equity Incentive Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Incremental Compensation Cost $ 4,600,000          
Allocated Share-based Compensation Expense 1,300,000          
Employee Stock Option [Member] | 2011 Equity Incentive Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value       $ 25.26    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 12,000,000     $ 12,000,000    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition       3 years 146 days    
Employee Stock Option [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 248,825 279,247   528,072    
Stock Appreciation Rights (SARs) [Member] | 2011 Equity Incentive Plan [Member]            
Allocated Share-based Compensation Expense $ 1,900,000   $ 1,000,000 $ 2,800,000 $ 1,500,000  
Stock Appreciation Rights (SARs) [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       3,000    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Cancelled in Period 167,400     167,400    
Restricted Stock [Member] | 2011 Equity Incentive Plan [Member]            
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 3,400,000     $ 3,400,000    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition       3 years 182 days    
Restricted Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       34,566    
2011 Equity Incentive Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 808,444     808,444   514,631
Share-based Compensation Arrangement by Share-based Payment Award Grants in Period Fair Value $ 5,200,000   $ 0 $ 17,100,000 $ 600,000  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 63,036     63,036