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Note 15 - Share-based Compensation (Details Textual) - USD ($) |  |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended | 18 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 10, 2020 | Oct. 04, 2019 | Feb. 07, 2019 | Aug. 01, 2016 | Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2015 | Mar. 31, 2020 | Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) |  |  |  |  | 3,103,558 |  | 3,103,558 |  | 2,219,268 |  |  | 3,103,558 |
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 |  |  |  |  | $ 420,168 |  | $ 420,168 |  |  |  |  | $ 420,168 |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  |  |  |  |  | 2 years 102 days |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  | $ 295,290 | $ 171,975 | $ 453,617 | $ 305,820 |  |  |  |  |
Share-based Payment Arrangement, Noncash Expense, Total |  |  |  |  |  |  | $ 453,617 | $ 305,820 |  |  |  |  |
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) |  |  |  |  | $ 2.48 |  | $ 2.48 |  | $ 1.94 |  |  | $ 2.48 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year) |  |  |  |  |  |  | 4 years 146 days |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value |  |  |  |  | $ 2,603,494 |  | $ 2,603,494 |  |  |  |  | $ 2,603,494 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value |  |  |  |  | $ 1,931,620 |  | $ 1,931,620 |  |  |  |  | $ 1,931,620 |
Share Price (in dollars per share) |  |  |  |  | $ 3.27 |  | $ 3.27 |  |  |  |  | $ 3.27 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value |  |  |  |  |  |  | $ 241,715 | $ 34,903 |  |  |  |  |
Proceeds from Stock Options Exercised |  |  |  |  |  |  | 258,047 | 45,172 |  |  |  |  |
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
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
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  |  |  |  | $ 788,161 |  | $ 788,161 |  |  |  |  | $ 788,161 |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  |  |  |  |  | 1 year 204 days |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  | $ 167,724 | 140,370 | $ 294,090 | 219,482 |  |  |  |  |
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 |  |  |  |  | 95,750 |  | $ 95,750 |  | $ 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 |  |  |  |  | $ 127,566 | $ 31,605 | $ 159,527 | $ 86,338 |  |  |  |  |
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) |  |  |  |  | 303,014 |  | 303,014 |  |  |  |  | 303,014 |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) |  |  |  |  | 4,009,489 |  | 4,009,489 |  |  |  |  | 4,009,489 |
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) |  |  |  |  | 3,103,558 |  | 3,103,558 |  |  |  |  | 3,103,558 |
2005 Equity Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) |  |  |  |  | 602,917 |  | 602,917 |  |  |  |  | 602,917 |

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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=120381028&loc=d3e5070-113901 + Details
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