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Note 10 - Stock-based Compensation (Details Textual) - USD ($) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Nov. 14, 2017 | Dec. 31, 2018 | Nov. 30, 2018 | Nov. 30, 2017 | Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance |  |  |  |  | 0 |  | 0 |
Share-based Payment Arrangement, Expense |  |  |  |  | $ 724,970 | $ 731,995 | $ 2,255,937 | $ 1,730,112
Restricted Stock [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance |  |  |  |  | 456,666 |  | 456,666 |
The 2010 Plan [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized | 500,000 |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | 1,500,000 |  |  |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  |  |  |  | $ 3,837,805 |  | $ 3,837,805 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period |  |  |  |  | 0 |  | 35,625 | 190,000
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period |  |  |  |  |  |  | 19,513 | 93,026
Proceeds from Stock Options Exercised |  |  |  |  |  |  | $ 0 | $ 0
The 2010 Plan [Member] | Restricted Stock [Member] | Executives and Non-executive Directors [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  | 155,000 | 155,000 |  |  |  |
The 2010 Plan [Member] | Restricted Stock [Member] | Executives and Non-executive Directors [Member] | November 2017 Grant [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance |  |  |  |  | 155,000 |  | 155,000 |
The 2010 Plan [Member] | Restricted Stock [Member] | Executives and Non-executive Directors [Member] | November 2018 Grant [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance |  |  |  |  | 155,000 |  | 155,000 |
The 2010 Plan [Member] | Restricted Stock [Member] | Two Executives and Non-executive Directors [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance |  |  |  |  | 146,666 |  | 146,666 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  | 146,666 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period |  | 117,332 |  |  |  |  |  |

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