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Note 9 - Equity Compensation (Details) - USD ($) | 6 Months Ended | 12 Months Ended | 24 Months Ended
--- | --- | --- | ---
Jun. 30, 2015 | Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2014
Note 9 - Equity Compensation (Details) [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term |  | 6 years 36 days | 5 years 146 days | 5 years 219 days | 5 years 292 days |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares) | 1,296,933 | 1,296,933 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number (in Shares) | 2,677,436 | 2,677,436 | 2,677,464 | 2,341,150 | 2,006,250 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in Shares) | 1,597,238 | 1,597,238 | 1,874,326 | 1,643,050 |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | $ 1,452,560 | $ 1,452,560 |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition |  | 37 months |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares) |  | 734,323 | 436,000 | 414,750 |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in Dollars per share) |  | $ 6.83 | $ 7.24 | $ 6.58 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share) |  | $ 3.27 | $ 2.67 | $ 2.11 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term |  | 4 years 109 days | 4 years | 4 years 219 days |  |
Share-based Compensation, Valuation Assumptions, Expected Forfeiture Rate | 3.30% |  |  |  |  |
Stock or Unit Option Plan Expense |  | $ 1,239,000 | $ 1,005,000 | $ 842,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number (in Shares) | 2,652,168 | 2,652,168 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price (in Dollars per share) | $ 8.87 | $ 8.87 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value | $ 4,854,607 | $ 4,854,607 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term |  | 6 years 36 days |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value |  | $ 212,106 | 142,715 | 95,223 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Aggregate Grant Date Fair Value |  | 822,827 | 777,825 | 756,543 |  |
Proceeds from Stock Options Exercised |  | 850,000 | 399,000 | $ 175,000 |  |
Increase (Decrease) in Income Taxes Payable |  | (71,643) | (48,747) |  |  |
Increase (Decrease) In Common Stock Related To Stock Option Exercises |  | (242,385) | 13,009 |  |  |
Reduction of Income Tax Expense Related to the Exercises of Stock Options |  | 30,149 | 27,693 |  |  |
Reduction Of Deferred Tax Asset Related To Stock Option Exercises |  | $ 283,888 | $ 8,045 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period (in Shares) |  | 26,850 | 23,205 | 8,092 |  |
Stock Issued During Period, Value, Share-based Compensation, Gross |  | $ 191,000 | $ 192,100 | $ 56,700 |  |
Treasury Stock, Shares (in Shares) | 226,600 | 226,600 | 307,328 |  |  |
Treasury Stock, Value | $ 2,145,100 | $ 2,145,100 | $ 2,914,700 |  |  |
Treasury Stock, Value, Acquired, Cost Method |  |  | 124,000 | 150,000 |  |
Excluding Tax Effect of Disqualified Dispositions [Member] |  |  |  |  |  |
Note 9 - Equity Compensation (Details) [Line Items] |  |  |  |  |  |
Proceeds from Stock Options Exercised |  | 1,092,002 | 377,401 | 175,023 |  |
Employee Salary Deferrals or Company Contributions [Member] |  |  |  |  |  |
Note 9 - Equity Compensation (Details) [Line Items] |  |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method |  | $ 205,600 | $ 183,100 |  |  |
Treasury Stock, Shares, Acquired (in Shares) |  | 27,902 | 24,215 |  |  |
Employee Stock Option [Member] |  |  |  |  |  |
Note 9 - Equity Compensation (Details) [Line Items] |  |  |  |  |  |
Stock or Unit Option Plan Expense |  | $ 1,238,897 | $ 1,004,676 | $ 842,401 |  |
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% |  |  |  |
Maximum [Member] |  |  |  |  |  |
Note 9 - Equity Compensation (Details) [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term |  | 10 years |  |  |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in Dollars per share) |  | $ 8.23 | $ 8.44 | $ 6.58 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share) |  | $ 3.89 | $ 3.64 | $ 2.11 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term |  | 9 years 9 months | 9 years 6 months | 9 years 5 months |  |
Share-based Compensation, Valuation Assumptions, Expected Forfeiture Rate |  |  |  |  |  | 2.30%
Treasury Stock Acquired, Repurchase Authorization |  | 38,000 |  |  |  |
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) |  | $ 5.96 | $ 7.20 | $ 6.28 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share) |  | $ 2.19 | $ 2.64 | $ 2.00 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term |  | 9 years 5 months | 9 years 2 months | 9 years 2 months |  |
Share-based Compensation, Valuation Assumptions, Expected Forfeiture Rate |  |  |  |  |  | 2.00%
Treasury Stock Acquired, Repurchase Authorization |  | 33,000 |  |  |  |

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