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Note 11 - Share-based Compensation (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
The 2008 Plan [Member] |  |
Share-Based Payment Arrangement, Expense | $ 0 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Net of Forfeitures (in shares) | 0 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value | $ 0 | $ 8,000
The 2020 Plan [Member] |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Net of Forfeitures (in shares) | 0 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value | $ 0 | 0
Inducement Plan [Member] |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Net of Forfeitures (in shares) | 0 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value | $ 0 | 45,000
Share-Based Payment Arrangement, Expense, Tax Benefit | 0 | 5,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | 0 |
Share-Based Payment Arrangement, Expense (Reversal) | $ (6,000) | 19,000
The 2018 Plan [Member] |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value |  | $ 8,000
Oustanding Stock Options and Unvested RSU's [Member] |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) | 0 |
Oustanding Stock Options and Unvested RSU's [Member] | Minimum [Member] |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) | 1 year |
Oustanding Stock Options and Unvested RSU's [Member] | Maximum [Member] |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) |  | 4 years
Share-Based Payment Arrangement, Option [Member] | The 2008 Plan [Member] |  |
Share-Based Payment Arrangement, Expense | $ 1,000 | $ 6,000
Share-Based Payment Arrangement, Expense, Tax Benefit | 0 | 2,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | 0 |
Share-Based Payment Arrangement, Option [Member] | The 2020 Plan [Member] |  |
Share-Based Payment Arrangement, Expense | 47,000 | 58,000
Share-Based Payment Arrangement, Expense, Tax Benefit | 12,000 | 15,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $ 58,000 |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) | 1 year 1 month 6 days |
Share-Based Payment Arrangement, Option [Member] | CEO Inducement Plan [Member] |  |
Share-Based Payment Arrangement, Expense | $ 0 | 85,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value | 0 |
Share-Based Payment Arrangement, Expense, Tax Benefit | 0 | 21,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $ 0 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | 0 |
Restricted Stock [Member] | The 2018 Plan [Member] |  |
Share-Based Payment Arrangement, Expense | $ 235,000 | 101,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $ 78,000 |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) | 3 months 18 days |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | 304,513 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested | $ 104,000 | $ 120,000

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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 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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