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Note 10 - Equity Compensation (Details Textual) | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended | 60 Months Ended
--- | --- | --- | --- | --- | --- | ---
Nov. 30, 2016 shares | Mar. 31, 2018 USD ($) $ / shares shares | Mar. 31, 2017 USD ($) shares | Dec. 31, 2017 | Mar. 31, 2018 USD ($) $ / shares shares | Mar. 31, 2017 USD ($) $ / shares shares | Jun. 30, 2017 USD ($) shares | Jun. 30, 2016 shares | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term |  |  |  |  | 7 years 73 days | 7 years 146 days | 7 years 146 days | 6 years 219 days |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | shares |  | 1,449,521 |  |  | 1,449,521 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance | shares |  | 3,377,677 | 3,631,155 |  | 3,377,677 | 3,631,155 | 3,119,688 | 2,976,490 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number | shares |  | 1,586,881 | 1,423,528 |  | 1,586,881 | 1,423,528 |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total |  | $ 1,850,418 |  |  | $ 1,850,418 |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition |  |  |  |  | 1 year 270 days |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | shares |  |  |  |  | 794,537 | 1,256,623 |  |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares |  |  |  |  | $ 5.98 | $ 10.67 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares |  |  |  |  | $ 1.73 | $ 3.71 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term |  |  |  |  | 5 years 255 days | 5 years 109 days |  |  |
Share Based Compensation Valuation Assumptions Expected Forfeiture Rate |  | 8.79% |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number | shares |  | 2,973,412 |  |  | 2,973,412 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price | $ / shares |  | $ 8.35 |  |  | $ 8.35 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value |  | $ 2,008,424 |  |  | $ 2,008,424 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term |  |  |  |  | 7 years |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value |  |  |  |  | $ 39,011 | $ 1,094,696 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Aggregate Grant Date Fair Value |  |  |  |  | 988,080 | 2,260,014 |  |  |
Proceeds from Stock Options Exercised |  |  |  |  | 285,875 | 2,612,578 |  |  |
Reduction of Federal Income Taxes Payable Related To Stock Option Exercise |  |  |  |  | 103,616 | 465,521 |  |  |
Increase (Decrease) In Common Stock Related To Stock Option Exercise |  |  |  |  | 794,756 | (138,793) |  |  |
Increase of Income Tax Expense Related to Stock Option Exercises |  |  |  |  | 92,996 |  |  |  |
Reduction of Deferred Tax Asset Related to Stock Option Exercises |  |  |  |  | $ 196,612 | 495,175 |  |  |
Reduction of Income Tax Expense Related to Stock Option Exercises |  |  |  |  |  | $ 109,140 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period | shares |  |  |  |  | 31,374 | 31,782 |  |  |
Stock Issued During Period, Value, Share-based Compensation, Gross |  |  |  |  | $ 234,000 | $ 331,000 |  |  |
Deferred Compensation Plan, Number of Participants |  | 38 |  |  | 38 |  |  |  |
Treasury Stock, Shares, Ending Balance | shares |  | 229,970 |  |  | 229,970 |  | 257,898 |  |
Treasury Stock, Value, Ending Balance |  | $ 2,045,189 |  |  | $ 2,045,189 |  | $ 2,456,875 |  |
Deferred Compensation Arrangement with Individual, Shares Issued | shares |  |  |  |  | 54,360 |  | 0 |  |
Employee Salary Deferrals or Company Contributions [Member] |  |  |  |  |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method |  |  |  |  | $ 106,537 | $ 446,251 |  |  |
Treasury Stock, Shares, Acquired | shares |  |  |  |  | 15,225 | 45,335 |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |
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 | $ / shares |  |  |  |  | $ 6.54 | $ 11.06 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares |  |  |  |  | $ 1.96 | $ 3.83 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term |  |  |  |  | 9 years 292 days | 10 years |  |  |
Share Based Compensation Valuation Assumptions Expected Forfeiture Rate |  |  |  |  |  |  |  |  | 8.54%
Minimum [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares |  |  |  |  | $ 5.92 | $ 9.48 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares |  |  |  |  | $ 1.71 | $ 3.22 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term |  |  |  |  | 9 years 109 days | 9 years 109 days |  |  |
Share Based Compensation Valuation Assumptions Expected Forfeiture Rate |  |  |  |  |  |  |  |  | 2.00%
Service-based Options [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  | 3 years |  |  | 4 years |  |
Performance-based Options [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  | 3 years |  |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  | 3 years | 4 years |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total |  | $ 698,571 |  |  | $ 698,571 |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition |  |  |  |  | 2 years 90 days |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Ending Balance | shares |  | 180,150 | 135,585 |  | 180,150 | 135,585 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | shares |  |  |  |  |  | 1,256,623 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares |  |  |  |  | $ 5.92 | $ 10.84 |  |  |
Share Based Compensation Valuation Assumptions Expected Forfeiture Rate |  |  |  |  | 8.30% | 3.40% |  |  |
Allocated Share-based Compensation Expense, Total |  | $ 88,811 | $ 93,905 |  | $ 426,121 | $ 486,102 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | shares |  |  |  |  | 91,490 | 96,210 |  |  |
Dividends, Total |  |  |  |  | $ 44,946 | $ 24,120 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms |  |  |  |  | 4 years 295 days | 6 years 73 days |  |  |
Share-based Compensation Arrangement By Share-based Payment Award, Equity Other Than Options, Vested and Expected To Vest, Outstanding, Number | shares |  | 170,769 | 130,316 |  | 170,769 | 130,316 |  |  |
Employee Stock Option [Member] |  |  |  |  |  |  |  |  |
Allocated Share-based Compensation Expense, Total |  | $ 202,811 | $ 510,851 |  | $ 1,328,539 | $ 1,806,860 |  |  |
The 2012 Stock Incentive Plan [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized | shares | 1,600,000 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fungible Share Ratio | 2.5 |  |  |  |  |  |  |  |

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- Definition Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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