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Note 11 - Equity Plans (Details Textual) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
C-Suite Long-Term Incentive Plan [Member] |  |  |
Minimum Return on Assets for Performance-Based Incentives | 5.00% |  |
Performance-Based Award Cap, Percentage of Grant | 150.00% |  |
Chief Executive Officer [Member] | C-Suite Long-Term Incentive Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Amount Per Employee | $ 1,100,000 |  | $ 1,100,000
President and Chief Operating Officer [Member] | C-Suite Long-Term Incentive Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Amount Per Employee | 800,000 |  | 600,000
Chief Financial Officer [Member] | C-Suite Long-Term Incentive Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Amount Per Employee | $ 500,000 |  | $ 300,000
Restricted Stock [Member] |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | 10,050 | 0 |
Restricted Stock [Member] | Non-Employee Director [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Value | $ 110,000 |  |
Restricted Stock [Member] | Non-Employee Director [Member] | Share-Based Payment Arrangement, Tranche One [Member] |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage | 33.33% |  |
Restricted Stock Units (RSUs) [Member] |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | 34,486 | 49,768 |
Restricted Stock Units (RSUs) [Member] | C-Suite Long-Term Incentive Plan [Member] |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | 17,243 |  | 20,000
Restricted Stock Units (RSUs) [Member] | Non-Employee Director [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Value |  |  | $ 80,000
Restricted Stock Units (RSUs) [Member] | Non-Employee Director [Member] | Share-Based Payment Arrangement, Tranche One [Member] |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) |  |  | 1 year
Performance Shares [Member] | C-Suite Long-Term Incentive Plan [Member] |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | 17,243 |  | 20,000
Service Based Cash Awards [Member] | C-Suite Long-Term Incentive Plan [Member] |  |  |
Deferred Compensation Arrangement with Individual, Cash Award Granted, Amount | $ 37,400 |  | $ 300,000
Performance-Based Cash Awards [Member] | C-Suite Long-Term Incentive Plan [Member] |  |  |
Deferred Compensation Arrangement with Individual, Cash Award Granted, Amount | $ 37,400 |  | $ 300,000
Common Stock [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) |  |  | 1,400,000

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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 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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