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Note 8 - Stock-Based Compensation (Detail) (USD $)
3 Months Ended 0 Months Ended 3 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Restricted Stock Units (RSUs) [Member]
Mar. 31, 2012
Restricted Stock Units (RSUs) [Member]
May 17, 2011
Full Value Awards [Member]
Mar. 31, 2013
Full Value Awards [Member]
Mar. 31, 2012
Full Value Awards [Member]
Sep. 30, 2012
Full Value Awards [Member]
Mar. 31, 2013
Non-Full Value Awards [Member]
Mar. 31, 2013
Phantom Share Units (PSUs) [Member]
Mar. 31, 2012
Phantom Share Units (PSUs) [Member]
Sep. 30, 2012
Phantom Share Units (PSUs) [Member]
Mar. 31, 2013
Minimum [Member]
Share-based Compensation $ 1,993,000 $ 1,418,000               $ 99,000 $ 42,000    
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense 800,000 600,000                      
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted (in Shares) 8,589   230,675 230,675                  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in Shares)         625,000                
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares)           340,125     56,440        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period                         3 years
Share-based Compensation Arrangement by Share-based Payment Award, Contractual Term 10 years                        
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized               5,000,000 23,000        
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition           3 years 219 days     219 days        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value           2,700,000 1,900,000            
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period                       1 year  
Share Based Compensation, Distributions, Fair Value                   $ 1,000 $ 1,000