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Note 15 - Share-based Compensation (Details Textual) - USD ($) |  |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 10, 2020 | Oct. 04, 2019 | Feb. 07, 2019 | Aug. 01, 2016 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) |  |  |  |  | 2,730,430 |  | 2,730,430 |  | 2,219,268 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures, Total (in shares) |  |  |  |  |  |  | 1,133,727 | 0 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) |  |  |  |  |  |  | 7 years |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  |  |  |  | $ 378,436 |  | $ 378,436 |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  |  |  |  |  | 2 years 7 days |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  | $ 322,025 | $ 257,566 | $ 775,642 | $ 563,388 |  |  |
Share-based Payment Arrangement, Noncash Expense, Total |  |  |  |  |  |  | $ 775,642 | $ 563,386 |  |  |
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares) |  |  |  |  |  |  | 13,063 | 0 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance (in dollars per share) |  |  |  |  | $ 2.54 |  | $ 2.54 |  | $ 1.94 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year) |  |  |  |  |  |  | 4 years 182 days |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value |  |  |  |  | $ 6,327,111 |  | $ 6,327,111 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value |  |  |  |  | $ 3,292,311 |  | $ 3,292,311 |  |  |  |
Share Price (in dollars per share) |  |  |  |  | $ 4.86 |  | $ 4.86 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value |  |  |  |  |  |  | $ 2,232,469 | $ 97,609 |  |  |
Proceeds from Stock Options Exercised |  |  |  |  |  |  | $ 996,891 | 54,621 |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance (in dollars per share) |  |  |  |  | 1.31 |  | $ 1.31 |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance (in dollars per share) |  |  |  |  | $ 3.40 |  | $ 3.40 |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  |  |  |  | $ 675,622 |  | $ 675,622 |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  |  |  |  |  | 1 year 113 days |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  | 136,415 | 124,991 | $ 430,506 | 344,473 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  |  |  |  |  | 231,270 |  |  |  |
Restricted Stock Units (RSUs) [Member] | Employees [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) |  |  |  |  |  |  | 3 years |  | 3 years | 3 years |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  |  |  |  |  | 81,270 |  | 99,300 | 93,330 |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  |  |  |  |  |  |  |  | 3 years |
Share-based Payment Arrangement, Noncash Expense, Total |  |  |  |  |  |  | $ 257,626 |  | $ 248,250 | $ 210,176 |
Restricted Stock Units (RSUs) [Member] | Non-employee Directors [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Noncash Expense, Total |  |  | $ 412,500 |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Options, Annual Grants, Gross (in shares) |  |  | 30,000 |  |  |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] | Board of Director [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | 30,000 |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Noncash Expense, Total | $ 424,500 |  |  |  |  |  |  |  |  |  |
Performance Shares [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) |  | 93,750 |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) |  | 7 years |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) |  | 800,000 |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  | 153,873 |  | 249,623 |  | $ 151,181 |  |
Performance Shares [Member] | Chief Executive Officer [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) |  |  |  | 7 years |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) |  |  |  | 750,000 |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Performance Criteria, Maximum Vested Per Year, Number (in shares) |  |  |  | 375,000 |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares (in shares) |  |  |  |  |  |  |  |  | 187,500 |  |
Share-based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  | $ 185,610 | $ 124,991 | $ 345,136 | $ 218,915 |  |  |
2015 Equity Plan [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in shares) |  |  |  |  |  |  |  |  |  |  | 5,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) |  |  |  |  | 191,000 |  | 191,000 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) |  |  |  |  | 3,637,674 |  | 3,637,674 |  |  |  |
2015 Equity Plan [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Ending Balance (in shares) |  |  |  |  | 2,842,444 |  | 2,842,444 |  |  |  |
2005 Equity Plan [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) |  |  |  |  | 604,230 |  | 604,230 |  |  |  |

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