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Note 11 - Stock-based Compensation Plan (Details Textual) $ / shares in Units, $ in Thousands |  |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 06, 2024 USD ($) shares | Jan. 16, 2024 USD ($) shares | May 08, 2023 USD ($) shares | Mar. 08, 2023 USD ($) shares | Mar. 09, 2022 USD ($) shares | Mar. 08, 2022 | Oct. 01, 2021 shares | Mar. 10, 2021 shares | Aug. 31, 2020 | Dec. 31, 2023 | Mar. 31, 2023 shares | Sep. 30, 2024 USD ($) $ / shares shares | Sep. 30, 2023 USD ($) $ / shares shares | Dec. 31, 2023
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) | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 6.55 | $ 9.43 |
Number of Operating Segments |  |  |  | 2 |  |  |  |  |  |  |  | 3 |  |
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) |  |  |  |  |  |  |  |  |  |  |  | 138,838 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares) |  |  |  |  |  |  |  |  |  |  |  | 94,666 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value | $ |  |  |  |  |  |  |  |  |  |  |  | $ 761 | $ 1,688 |
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] | 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, Options, Nonvested Options Forfeited, Number of Shares (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 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 |  |  |  |  |  |  |  |  |  |  | 75.00% |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number (in shares) |  |  |  |  |  |  |  |  |  |  | 6,000 |  |  |
Performance-Based Restricted Stock [Member] | Members of The Senior Management [Member] | Share-Based Payment Arrangement, Vesting on Third Anniversary of Grant Date [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares) |  |  |  |  |  |  |  |  |  |  | 12,000 |  |  |
Performance-Based Restricted Stock [Member] | Members of The Senior Management [Member] | Share-Based Payment Arrangement, Tranche Two [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) |  |  |  |  |  |  |  |  |  |  | 6,000 |  |  |
Performance-Based Restricted Stock [Member] | Members of The Senior Management [Member] | Vesting on January 1, 2025, Based on Performance Metrics [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage |  |  |  |  |  |  |  |  |  |  |  | 0.00% |  | 50.00%
Performance-Based Restricted Stock [Member] | Members of The Senior Management [Member] | Vesting on January 1, 2025, 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 [Member] | Members of The Senior Management [Member] | Vesting on January 1, 2025, Based on Performance Metrics [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] | Chief Executive Officer and Chief Financial Officer [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement By Share-based Payment Award, Award Vesting Rights Percentage Lower Range |  |  |  |  | 0.00% | 0.00% |  |  |  |  |  |  |  |
Share-based Compensation Arrangement By Share-based Payment Award, Award Vesting Rights Percentage Upper Range |  |  |  |  | 150.00% | 150.00% |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |
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% |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Probable Final Vesting Percentage |  |  |  |  |  |  |  |  |  | 50.00% |  | 0.00% |  |
Performance-Based Restricted Stock [Member] | President of Environmental Technologies [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
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) |  |  | 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] | Share-Based Payment Arrangement, Tranche One [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |
Performance-Based Restricted Stock [Member] | President of Process Technologies [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  | 8,231 |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Granted, Fair Value | $ |  | $ 100 |  |  |  |  |  |  |  |  |  |  |  |
Performance-Based Restricted Stock [Member] | President of Process Technologies [Member] | Share-Based Payment Arrangement, Tranche One [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 [Member] | Chief Executive Officer, Chief Financial Officer, and Division Presidents [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | 33,539 |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Granted, Fair Value | $ | $ 380 |  |  |  |  |  |  |  |  |  |  |  |  |
Performance-Based Restricted Stock [Member] | Chief Executive Officer, Chief Financial Officer, and Division Presidents [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, 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% |  |  |  |  |  |  |  |  |  |  |  |  |
The 2023 Stock Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $ |  |  |  |  |  |  |  |  |  |  |  | $ 3,560 |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  |  |  |  |  |  |  |  |  |  | 2 years 3 months 18 days |  |
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% |  |  |  |  |

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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 Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 49 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482785/280-10-55-49 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-18 + 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 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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