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Note 13 - Stock-based Compensation Plan (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 24, 2023 | May 08, 2023 | Mar. 08, 2023 | Dec. 31, 2022 | Mar. 09, 2022 | Mar. 08, 2022 | Oct. 01, 2021 | Jun. 14, 2021 | Mar. 10, 2021 | Aug. 24, 2020 | Aug. 31, 2020 | Dec. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Jun. 21, 2023
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  |  |  |  |  |  |  |  |  |  |  | 2 years |  |  |
Share-Based Payment Arrangement, Amount Capitalized |  |  |  |  |  |  |  |  |  |  |  |  | $ 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) |  |  |  |  |  |  |  |  |  |  |  |  | $ 9.43 | $ 4.53 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,132 | $ 643 |  |
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) |  |  |  |  |  |  |  |  |  |  |  |  | 97,461 | 123,533 |  |
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% |  |
Performance-Based Restricted Stock [Member] | Chief Executive Officer and Chief Financial Officer [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  | 18,888 |  | 20,493 |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Granted, Fair Value |  |  | $ 303 |  | $ 200 |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period (in shares) | 40,557 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Performance-Based Restricted Stock [Member] | Chief Executive Officer and Chief Financial Officer [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement By Share-based Payment Award, Award Vesting Rights Percentage Lower Range |  |  |  |  | 0.00% | 0.00% |  |  |  |  |  |  |  |  |  |
Performance-Based Restricted Stock [Member] | Chief Executive Officer and Chief Financial Officer [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement By Share-based Payment Award, Award Vesting Rights Percentage Upper Range |  |  |  |  | 150.00% | 150.00% |  |  |  |  |  |  |  |  |  |
Performance-Based Restricted Stock [Member] | Chief Executive Officer and Chief Financial Officer [Member] | Share-Based Payment Arrangement, Tranche One [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  |  |  |  |  |  |  |  |  |  | 100.00% | 100.00% |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Probable Final Vesting Percentage |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Catch-Up Adjustment |  |  |  |  |  |  |  |  |  |  |  |  | $ 60 |  |  |
Performance-Based Restricted Stock [Member] | Chief Executive Officer and Chief Financial Officer [Member] | Vesting Based On Performance Metrics [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage | 50.00% |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Performance-Based 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) |  |  |  |  |  |  | 5,000 |  | 18,000 |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Granted, Fair Value |  |  |  |  |  |  | $ 59 |  | $ 191 |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Expected to Forfeit, Outstanding, Number (in shares) |  |  |  | 6,000 |  |  |  |  |  |  |  |  |  | 6,000 |  |
Performance-Based 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 Rights, Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number (in shares) |  |  |  | 12,000 |  |  |  |  |  |  |  | 6,000 | 6,000 | 12,000 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Probable Final Vesting Percentage |  |  |  |  |  |  |  |  |  |  |  | 0.00% | 88.00% |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Catch-Up Adjustment |  |  |  |  |  |  |  |  |  |  |  |  | $ 14 |  |  |
Performance-Based Restricted Stock [Member] | Members of The Senior Management [Member] | Share-Based Payment Arrangement, Tranche One [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement By Share-based Payment Award, Award Vesting Rights Percentage Lower Range |  |  |  |  |  |  |  |  | 0.00% |  |  |  |  |  |  |
Performance-Based Restricted Stock [Member] | Members of The Senior Management [Member] | Share-Based Payment Arrangement, Tranche One [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement By Share-based Payment Award, Award Vesting Rights Percentage Upper Range |  |  |  |  |  |  |  |  | 150.00% |  |  |  |  |  |  |
Performance-Based Restricted Stock [Member] | President of Environmental Technologies [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  | 5,081 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Granted, Fair Value |  | $ 108 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Performance-Based Restricted Stock [Member] | President of Environmental Technologies [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement By Share-based Payment Award, Award Vesting Rights Percentage Lower Range |  | 0.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Performance-Based Restricted Stock [Member] | President of Environmental Technologies [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement By Share-based Payment Award, Award Vesting Rights Percentage Upper Range |  | 150.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Performance-Based Restricted Stock [Member] | President of Environmental Technologies [Member] | Share-Based Payment Arrangement, Tranche One [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |
The 2023 Stock Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 350,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,117,942
Stock Plan 2014 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount |  |  |  |  |  |  |  |  |  |  |  | $ 2,957 | $ 2,957 |  |  |
Restricted Stock Vesting in Three Years [Member] | Restricted Stock [Member] | Vesting Based On Performance Metrics [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% |  |  |  |  |
Performance-Based Restricted Stock Vesting in Three Years [Member] | Performance-Based Restricted Stock [Member] | Vesting Based On Performance Metrics [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement By Share-based Payment Award, Award Vesting Rights Percentage Upper Range | 150.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Performance-Based Restricted Stock Vesting in Three Years [Member] | Performance-Based Restricted Stock [Member] | President [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, Equity Instruments Other than Options, Granted, Fair Value |  |  |  |  |  |  |  |  |  | $ 345 |  |  |  |  |  |
Performance-Based Restricted Stock Vesting in Three Years [Member] | Performance-Based Restricted Stock [Member] | President [Member] | Share-Based Payment Arrangement, Tranche One [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement By Share-based Payment Award, Award Vesting Rights Percentage Lower Range |  |  |  |  |  |  |  |  |  | 0.00% |  |  |  |  |  |
Performance-Based Restricted Stock Vesting in Three Years [Member] | Performance-Based Restricted Stock [Member] | President [Member] | Share-Based Payment Arrangement, Tranche One [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement By Share-based Payment Award, Award Vesting Rights Percentage Upper Range |  |  |  |  |  |  |  |  |  | 150.00% |  |  |  |  |  |
Performance-Based Restricted Stock Vesting in Three Years [Member] | Performance-Based 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) |  |  |  |  |  |  |  | 5,953 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Granted, Fair Value |  |  |  |  |  |  |  | $ 100 |  |  |  |  |  |  |  |
Performance-Based Restricted Stock Vesting in Three Years [Member] | Performance-Based Restricted Stock [Member] | Chief Executive Officer and Chief Financial Officer [Member] | Share-Based Payment Arrangement, Tranche One [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement By Share-based Payment Award, Award Vesting Rights Percentage Upper Range |  |  |  | 150.00% |  |  |  |  |  |  |  |  |  |  |  |
Restricted Stock Vesting on August 24, 2023 [Member] | Performance-Based Restricted Stock [Member] | Chief Financial Officer [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Probable Final Vesting Percentage |  |  |  |  |  |  |  | 0.00% |  |  |  |  |  |  |  |
Performance-Based Restricted Stock Vesting on January 1, 2025 [Member] | Performance-Based Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Catch-Up Adjustment |  |  |  |  |  |  |  |  |  |  |  |  | $ 20 |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Additional Award Vesting Rights, Percentage | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Performance-Based Restricted Stock Vesting on January 1, 2025 [Member] | Performance-Based Restricted Stock [Member] | Members of The Senior Management [Member] | Vesting Based On Performance Metrics [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |
Performance-Based Restricted Stock Vesting on January 1, 2025 [Member] | Performance-Based Restricted Stock [Member] | Members of The Senior Management [Member] | Vesting Based On Performance Metrics [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement By Share-based Payment Award, Award Vesting Rights Percentage Lower Range |  |  |  |  |  |  | 0.00% |  |  |  |  |  |  |  |  |
Performance-Based Restricted Stock Vesting on January 1, 2025 [Member] | Performance-Based Restricted Stock [Member] | Members of The Senior Management [Member] | Vesting Based On Performance Metrics [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement By Share-based Payment Award, Award Vesting Rights Percentage Upper Range |  |  |  |  |  |  | 150.00% |  |  |  |  |  |  |  |  |

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- Definition Lower range limit of percentage of vesting of award under share-based payment arrangement. + References No definition available. + Details
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- Definition The catch-up adjustment resulting from an adjustment in the expected vesting percentage for a share-based compensation arrangement. + References No definition available. + Details
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- Definition Fair value of awards other than options granted during the period. + References No definition available. + Details
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- Definition Number of expected to forfeit options outstanding. + References No definition available. + Details
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- Definition Probable final vesting percentage of share-based payment award. + References No definition available. + Details
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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 -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(1)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + 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 -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + 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 -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + 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 -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Number of shares authorized for issuance under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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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 -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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