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Note 9 - Equity Compensation (Details Textual) | 3 Months Ended | 12 Months Ended | 75 Months Ended
--- | --- | --- | ---
Jun. 30, 2019 USD ($) $ / shares shares | Jun. 30, 2019 USD ($) $ / shares shares | Jun. 30, 2018 USD ($) $ / shares shares | Jun. 30, 2017 | Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  | 972,900 | 794,537 |  |
Class of Warrant or Right, Outstanding | 200,000 | 200,000 |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares | $ 9.95 | $ 9.95 |  |  |
Class of Warrant or Right, Remaining Contractual Life |  | 2 years 255 days |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights, Fair value | $ / shares | $ 2.87 | $ 2.87 |  |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares |  | 4.57 | $ 5.98 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares |  | $ 1.48 | $ 1.73 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term |  | 5 years 219 days | 5 years 292 days |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period |  | 1,406,548 | 467,609 |  |
Share Based Compensation Valuation Assumptions Expected Forfeiture Rate | 14.86% |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value | $ |  | $ 0 | $ 39,011 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Aggregate Grant Date Fair Value | $ |  | $ 2,287,386 | $ 3,192,672 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period |  | 0 | 42,939 |  |
Proceeds from Stock Options Exercised | $ |  |  | $ 285,875 |  |
Reduction of Deferred Tax Asset Related to Stock Option Exercises | $ |  | $ 282,785 | 292,000 |  |
Reduction of Federal Income Taxes Payable Related To Stock Option Exercise | $ |  |  | 116,602 |  |
Reduction of Income Tax Expense Related to Stock Option Exercises | $ |  |  | $ 10,767 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period |  | 104,020 | 41,388 |  |
Shares Issued, Value, Share-based Payment Arrangement, before Forfeiture | $ |  | $ 374,000 | $ 312,000 |  |
Deferred Compensation Plan, Number of Participants | 32 | 32 |  |  |
Deferred Compensation Arrangement with Individual, Shares Issued |  | 74,721 | 67,138 |  |
Employee Salary Deferrals or Company Contributions [Member] |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method | $ |  |  | $ 106,537 |  |
Treasury Stock, Shares, Acquired |  |  | 15,225 |  |
Deferred Compensation Plan With Rabbit Trust [Member] |  |  |  |  |
Treasury Stock, Shares, Ending Balance | 208,965 | 208,965 | 241,996 |  |
Treasury Stock, Value, Ending Balance | $ | $ 1,468,161 | $ 1,468,161 | $ 2,110,248 |  |
Inducement Stock Option [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  | 3 years |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period |  | 10 years |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  | 550,000 |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  | 4 years |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares |  |  | $ 5.92 |  |
Share Based Compensation Valuation Assumptions Expected Forfeiture Rate |  | 8.30% |  |  |
Share-based Payment Arrangement, Expense | $ |  | $ 40,893 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  | 0 | 91,490 |  |
Dividends, Total | $ |  | $ 16,848 | $ 50,621 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Ending Balance | 33,042 | 33,042 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms |  | 3 years 182 days |  |  |
Share-based Compensation Arrangement By Share-based Payment Award, Equity Other Than Options, Vested and Expected To Vest, Outstanding, Number | 32,429 | 32,429 |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $ | $ 45,683 | $ 45,683 |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition |  | 1 year 30 days |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance | 33,042 | 33,042 | 169,397 |  |
Performance-based Stock Options [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period |  |  | 345,560 |  |
Share-based Payment Arrangement, Option [Member] |  |  |  |  |
Share-based Payment Arrangement, Expense | $ |  | $ 876,333 | $ 2,147,423 |  |
Performance Stock Units [Member] |  |  |  |  |
Share Based Compensation Valuation Assumptions Expected Forfeiture Rate |  | 11.70% |  |  |
Share-based Payment Arrangement, Expense | $ |  | $ 62,474 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  | 134,350 | 0 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms |  | 2 years 36 days |  |  |
Share-based Compensation Arrangement By Share-based Payment Award, Equity Other Than Options, Vested and Expected To Vest, Outstanding, Number | 43,451 | 43,451 |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $ | $ 152,172 | $ 152,172 |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition |  | 2 years 30 days |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares |  | $ 4.94 |  |  |
Dividend, Share-based Payment Arrangement, Cash | $ |  | $ 11,310 | $ 0 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance | 56,550 | 56,550 |  |  |
Minimum [Member] |  |  |  |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares |  | $ 3.18 | $ 5.92 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares |  | $ 0.72 | $ 1.71 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term |  | 9 years | 9 years |  |
Share Based Compensation Valuation Assumptions Expected Forfeiture Rate |  |  |  |  | 2.00%
Maximum [Member] |  |  |  |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ / shares |  | $ 4.94 | $ 6.54 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares |  | $ 2.10 | $ 1.96 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term |  | 10 years | 10 years |  |
Share Based Compensation Valuation Assumptions Expected Forfeiture Rate |  |  |  |  | 8.79%
The 2012 Stock Incentive Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | 1,967,217 | 1,967,217 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fungible Share Ratio |  | 2.5 |  |  |
The 2012 Stock Incentive Plan [Member] | Minimum [Member] | Service-based and Performance-based Stock Options [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  | 3 years |  |  |
The 2012 Stock Incentive Plan [Member] | Minimum [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  | 3 years |  |  |
The 2012 Stock Incentive Plan [Member] | Maximum [Member] | Service-based and Performance-based Stock Options [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  | 4 years |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period |  | 10 years |  |  |
The 2012 Stock Incentive Plan [Member] | Maximum [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  | 4 years |  |  |

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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=116856206&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=116856206&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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