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Note 13 - Stock-based Compensation Plan (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Mar. 09, 2022 | Aug. 31, 2020 | Sep. 30, 2022 | Jun. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total |  |  | $ 3,298 |  |  | $ 3,298 |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  |  |  |  | 2 years 6 months |
Share-based Payment Arrangement, Amount Capitalized |  |  | $ 0 |  | $ 0 | $ 0 | $ 0
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) |  |  |  |  |  | $ 4.53 | $ 5.70
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value |  |  |  |  |  | $ 550 | $ 981
Share-Based Payment Arrangement, Option [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) |  |  |  |  |  | 10 years |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) |  |  |  |  |  | 4 years |
Restricted Stock [Member] |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  |  |  |  | 123,533 |
Restricted Stock [Member] | Restricted Stock Vesting in Three Years [Member] |  |  |  |  |  |  |
Share-Based Payment Arrangement, Accelerated Cost |  |  |  | $ 130 |  |  |
Restricted Stock [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% |  |  |  |  |
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% |  | 150.00% |  | 150.00% |
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 Payment Arrangement, Tranche Two [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 Compensation Award, Tranche Four [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  |  |  |  | 25.00% |
Restricted Stock [Member] | Chief Executive Officer and Chief Financial Officer [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% |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | 20,493 |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Value | $ 200 |  |  |  |  |  |

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- Definition Amount of cost capitalized for award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(ii) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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