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Note 15 - Share-based Compensation (Details Textual) - USD ($)
3 Months Ended 6 Months Ended 9 Months Ended
Feb. 29, 2016
Feb. 28, 2015
Feb. 29, 2016
Feb. 29, 2016
Feb. 28, 2015
Oct. 31, 2015
2011 Equity Incentive Plan [Member] | Performance Shares [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 $ 100,000    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition       182 days    
2011 Equity Incentive Plan [Member] | Service-based Options and Performance-based Option [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Incremental Compensation Cost     4,600,000      
2011 Equity Incentive Plan [Member] | Employee Stock Option [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value       $ 25.25    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized 11,000,000   11,000,000 $ 11,000,000    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition       3 years 73 days    
2011 Equity Incentive Plan [Member] | Restricted Stock [Member]            
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized 3,100,000   $ 3,100,000 $ 3,100,000    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition       3 years 109 days    
2011 Equity Incentive Plan [Member] | Stock Appreciation Rights (SARs) [Member]            
Allocated Share-based Compensation Expense $ 1,300,000 $ 300,000   $ 4,000,000 $ 1,800,000  
2011 Equity Incentive Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 808,444   808,444 808,444   514,631
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 66,166   66,166 66,166    
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%    
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    
Share-based Compensation Arrangement by Share-based Payment Award Grants in Period Fair Value $ 0 $ 100,000   $ 17,200,000 $ 700,000