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Note 10 - Stock-based Compensation (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 3 Months Ended | 4 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 14, 2021 | Mar. 10, 2021 | Aug. 24, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Jun. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  |  |  | $ 2,928 |  |  |  | $ 2,928 |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  |  |  |  |  |  | 2 years 7 months 6 days |  |
Share-based Payment Arrangement, Amount Capitalized |  |  |  | $ 0 | $ 0 |  | $ 0 | $ 0 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  |  |  |  |  |  | 4 years |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value |  |  |  |  |  |  |  | $ 981 | $ 296 |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) |  |  |  |  |  |  |  | 10 years |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) |  |  |  |  |  |  |  | $ 5.70 | $ 1.48 |
Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  |  |  |  |  |  | 126,209 |  |
Restricted Stock [Member] | Employees [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  |  |  |  |  |  | 4 years |  |
Restricted Stock [Member] | Independent Directors [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  |  |  |  |  |  | 1 year |  |
Restricted Stock [Member] | Independent Directors [Member] | Share-based Payment Arrangement, Tranche One [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  |  |  |  |  |  | 25.00% |  |
Restricted Stock [Member] | Independent Directors [Member] | Share-based Compensation Award, Tranche Four [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  |  |  |  |  |  | 25.00% |  |
Restricted Stock [Member] | Independent Directors [Member] | Share-based Payment Arrangement, Tranche Three [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  |  |  |  |  |  | 25.00% |  |
Restricted Stock [Member] | Independent Directors [Member] | Share-based Payment Arrangement, Tranche Two [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  |  |  |  |  |  | 25.00% |  |
Restricted Stock [Member] | President [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  | 141,610 |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Granted, Fair Value |  |  | $ 650 |  |  |  |  |  |  |
Restricted Stock [Member] | President [Member] | Restricted Stock Vesting in Four Years [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  | 4 years |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  | 66,448 |  |  |  |  |  |  |
Restricted Stock [Member] | President [Member] | Restricted Stock Vesting in Three Years [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  | 75,162 |  |  |  |  |  |  |
Share-based Compensation Arrangement By Share-based Payment Award, Award Vesting Rights Percentage Lower Range |  |  | 0.00% |  |  |  |  |  |  |
Share-based Compensation Arrangement By Share-based Payment Award, Award Vesting Rights Percentage Upper Range |  |  | 150.00% |  |  |  |  |  |  |
Restricted Stock [Member] | President [Member] | Share-based Payment Arrangement, Tranche One [Member] | Restricted Stock Vesting in Four Years [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  | 25.00% |  |  |  |  |  |  |
Restricted Stock [Member] | President [Member] | Share-based Payment Arrangement, Tranche One [Member] | Restricted Stock Vesting in Three Years [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  | 3 years |  |  |  |  |  |  |
Restricted Stock [Member] | President [Member] | Vesting Based On Performance Metrics [Member] | Restricted Stock Vesting in Three Years [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  |  |  |  |  |  |  |  | 100.00%
Restricted Stock [Member] | President [Member] | Share-based Compensation Award, Tranche Four [Member] | Restricted Stock Vesting in Four Years [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  | 25.00% |  |  |  |  |  |  |
Restricted Stock [Member] | President [Member] | Share-based Payment Arrangement, Tranche Three [Member] | Restricted Stock Vesting in Four Years [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  | 25.00% |  |  |  |  |  |  |
Restricted Stock [Member] | President [Member] | Share-based Payment Arrangement, Tranche Two [Member] | Restricted Stock Vesting in Four Years [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  | 25.00% |  |  |  |  |  |  |
Restricted Stock [Member] | Members of The Senior Management [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  | 18,000 |  |  |  |  |  |  |  |
Restricted Stock [Member] | Members of The Senior Management [Member] | Share-based Payment Arrangement, Tranche One [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  |  |  |  | 3 years |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  |  |  |  | 100.00% |  |  |  |
Share-based Compensation Arrangement By Share-based Payment Award, Award Vesting Rights Percentage Lower Range |  | 0.00% |  |  |  |  |  |  |  |
Share-based Compensation Arrangement By Share-based Payment Award, Award Vesting Rights Percentage Upper Range |  | 150.00% |  |  |  |  |  |  |  |
Restricted Stock [Member] | Chief Financial Officer [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | 7,941 |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Granted, Fair Value | $ 133 |  |  |  |  |  |  |  |  |
Restricted Stock [Member] | Chief Financial Officer [Member] | Restricted Stock Vesting in Four Years [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) | 4 years |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | 1,988 |  |  |  |  |  |  |  |  |
Restricted Stock [Member] | Chief Financial Officer [Member] | Restricted Stock Vesting on August 24, 2023 [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | 5,953 |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement By Share-based Payment Award, Award Vesting Rights Percentage Lower Range | 0.00% |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement By Share-based Payment Award, Award Vesting Rights Percentage Upper Range | 150.00% |  |  |  |  |  |  |  |  |
Restricted Stock [Member] | Chief Financial Officer [Member] | Share-based Payment Arrangement, Tranche One [Member] | Restricted Stock Vesting in Four Years [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage | 25.00% |  |  |  |  |  |  |  |  |
Restricted Stock [Member] | Chief Financial Officer [Member] | Vesting Based On Performance Metrics [Member] | Restricted Stock Vesting on August 24, 2023 [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  |  |  |  |  |  | 100.00% |  |
Restricted Stock [Member] | Chief Financial Officer [Member] | Share-based Compensation Award, Tranche Four [Member] | Restricted Stock Vesting in Four Years [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage | 25.00% |  |  |  |  |  |  |  |  |
Restricted Stock [Member] | Chief Financial Officer [Member] | Share-based Payment Arrangement, Tranche Three [Member] | Restricted Stock Vesting in Four Years [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage | 25.00% |  |  |  |  |  |  |  |  |
Restricted Stock [Member] | Chief Financial Officer [Member] | Share-based Payment Arrangement, Tranche Two [Member] | Restricted Stock Vesting in Four Years [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage | 25.00% |  |  |  |  |  |  |  |  |

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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