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Note 15 - Share-based Compensation (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended | 50 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 01, 2021 | Mar. 16, 2021 | Mar. 10, 2020 | Oct. 04, 2019 | Aug. 01, 2016 | Jun. 30, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Dec. 08, 2020 | Oct. 02, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) |  |  |  |  |  |  | 8,212,968 |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) |  |  |  |  |  |  | 267,000 | 215,000 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) |  |  |  |  |  |  | 7 years |  |  |  |  |  |  |
Dividends, Total |  |  |  |  |  |  | $ 0 |  |  | $ 0 |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount |  |  |  |  |  |  | $ 1,519 |  |  |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  |  |  |  |  | 1 year 9 months 18 days |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  |  |  | $ 558 | $ 182 |  |  |  |  |  |
Shares Granted, Value, Share-based Payment Arrangement, before Forfeiture |  |  |  |  |  |  | $ 40 |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance (in dollars per share) |  |  |  |  |  |  | $ 3.20 |  | $ 3.02 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year) |  |  |  |  |  |  | 3 years 10 months 9 days |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value |  |  |  |  |  |  | $ 3,373 |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value |  |  |  |  |  |  | $ 2,816 |  |  |  |  |  |  |
Share Price (in dollars per share) |  |  |  |  |  |  | $ 3.98 |  |  |  |  |  |  | $ 5.98
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value |  |  |  |  |  |  | $ 74 | 113 |  |  |  |  |  |
Gross Proceeds from Stock Options Exercised |  |  |  |  |  |  | 46 | 54 |  |  |  |  |  |
Proceeds from Stock Options Exercised |  |  |  |  |  |  | $ 46 | 54 |  |  |  |  |  |
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) |  |  |  |  |  |  | $ 8.03 |  |  |  |  |  |  |
Selling, General and Administrative Expenses [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  |  |  | $ 531 | $ 171 |  |  |  |  |  |
Common Stock Award [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) |  |  |  |  |  |  | 4,813,115 |  |  |  |  |  |  |
Performance Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) |  |  |  |  |  |  | 0 | 0 |  |  |  |  |  |
Performance Shares [Member] | Key Executive [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) |  |  |  | 800,000 | 750,000 |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) |  |  |  | 7 years | 7 years |  |  |  |  |  |  |  |  |
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) |  |  |  |  |  |  |  |  |  | 375,000 | 187,500 |  |  |
Share-based Payment Arrangement, Expense |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |
Performance Shares [Member] | Key Executive [Member] | Selling, General and Administrative Expenses [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  |  |  |  |  |  |  |  | $ 459 |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  |  |  | $ 437 | $ 138 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  |  |  |  |  | 8,000 |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares) |  |  |  |  |  |  | (0) |  |  |  |  |  |  |
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 | 3 years |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  |  |  |  |  |  |  | 145,950 | 81,270 | 99,300 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |
Shares Granted, Value, Share-based Payment Arrangement, before Forfeiture |  |  |  |  |  |  |  |  | $ 989 | $ 258 | $ 248 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares) |  |  |  |  |  | 5,000 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value |  |  |  |  |  | $ 25 |  |  |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] | Board of Directors [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | 17,500 | 27,883 | 30,000 |  |  |  |  |  |  |  |  |  |  |
Shares Granted, Value, Share-based Payment Arrangement, before Forfeiture | $ 184 | $ 1,100 | $ 425 |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Option [Member] | Employees, Directors, and Consultants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  |  |  | $ 120 | $ 44 |  |  |  |  |  |
2015 Equity Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) |  | 10,000,000 |  |  |  |  |  |  |  |  |  |  | 5,000,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Proposed Number of Shares Authorized (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 10,000,000 |
2015 Equity Plan [Member] | Options and RSUs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options and Equity Instruments Other than Options, Outstanding, Number (in shares) |  |  |  |  |  |  | 3,329,853 |  |  |  |  |  |  |
2005 Equity Plan [Member] | Options and RSUs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options and Equity Instruments Other than Options, Outstanding, Number (in shares) |  |  |  |  |  |  | 70,000 |  |  |  |  |  |  |

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