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Note 9 - Equity Compensation (Details) (USD $)
3 Months Ended 12 Months Ended
Jun. 30, 2014
Mar. 31, 2014
Sep. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Jun. 30, 2012
Jun. 30, 2011
Sep. 30, 2010
Jun. 30, 2010
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2011
Note 9 - Equity Compensation (Details) [Line Items]                          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares) 686,831                 686,831      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number (in Shares) 2,677,464         2,006,250 2,123,939     2,677,464 2,341,150 2,006,250 2,123,939
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in Shares) 1,874,326         1,404,400       1,874,326 1,643,050 1,404,400  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 614,781                 $ 614,781      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition                   30 months      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares)                   436,000 414,750 36,000  
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in Dollars per share)                   $ 7.24 $ 6.58 $ 7.13  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share)                   $ 2.67 $ 2.11 $ 2.58  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term                   5 years 146 days 5 years 219 days 5 years 292 days 6 years 109 days
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit (in Dollars per share)                     $ 6.28    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit (in Dollars per share)                     $ 6.58    
Share-based Compensation, Valuation Assumptions, Expected Forfeiture Rate 2.00% 2.10% 2.20% 2.30% 3.40% 4.10% 3.60% 3.00% 6.55%        
Stock or Unit Option Plan Expense                   1,005,000 842,000 410,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number (in Shares) 2,667,192                 2,667,192      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price (in Dollars per share) $ 9.58                 $ 9.58      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value 1,664,121                 1,664,121      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term                   5 years 146 days      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value                   142,714 95,223 3,365  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Aggregate Grant Date Fair Value                   777,825 756,543 1,122,010  
Proceeds from Stock Options Exercised                   399,000 175,000 14,000  
Reduction of Federal Income Taxes Payable Related to Stock Option Exercises                   48,747      
Increase in Common Stock Related to Stock Option Exercises                   13,009      
Reduction of Income Tax Expense Related to Stock Option Exercises                   27,693      
Reduction of Deferred Tax Asset Related to Stock Option Exercises                   8,045      
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period (in Shares)                   23,205 8,092 7,076  
Stock Issued During Period, Value, Share-based Compensation, Gross                   192,100 56,700 47,700  
Treasury Stock, Shares (in Shares) 307,328                 307,328 288,505    
Treasury Stock, Value 2,914,700                 2,914,700 2,791,000    
Treasury Stock, Value, Acquired, Cost Method                   124,000 150,000 141,000  
Employee Stock Option [Member]
                         
Note 9 - Equity Compensation (Details) [Line Items]                          
Stock or Unit Option Plan Expense                   1,004,676 842,401 410,550  
Excluding Tax Effect of Disqualified Dispositions [Member]
                         
Note 9 - Equity Compensation (Details) [Line Items]                          
Proceeds from Stock Options Exercised                   377,401 175,023 14,235  
Each Ninety Days [Member] | Non-Employee Directors [Member]
                         
Note 9 - Equity Compensation (Details) [Line Items]                          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage                   25.00%      
Annually [Member] | Employees [Member]
                         
Note 9 - Equity Compensation (Details) [Line Items]                          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage                   25.00%      
Employee Salary Deferrals or Company Contributions [Member]
                         
Note 9 - Equity Compensation (Details) [Line Items]                          
Treasury Stock, Value, Acquired, Cost Method                   $ 183,100 $ 175,100    
Treasury Stock, Shares, Acquired (in Shares)                   24,215 25,549    
Minimum [Member]
                         
Note 9 - Equity Compensation (Details) [Line Items]                          
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in Dollars per share)                   $ 7.20   $ 6.68  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share)                   $ 2.64 $ 2.00 $ 2.45  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term                   9 years 2 months 9 years 2 months 9 years 5 months  
Treasury Stock Acquired, Repurchase Authorization                   19,000      
Maximum [Member]
                         
Note 9 - Equity Compensation (Details) [Line Items]                          
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in Dollars per share)                   $ 8.44   $ 7.22  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share)                   $ 3.64 $ 2.11 $ 2.60  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term                   9 years 6 months 9 years 5 months 9 years 8 months  
Treasury Stock Acquired, Repurchase Authorization                   23,000