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Note 5 - Share-based Compensation (Details Textual) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $ 8,800,000 |  | $ 8,800,000 |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  | 2 years 10 months 13 days |
Proceeds from Stock Options Exercised |  |  | $ 132,000 | $ 0
Share-Based Payment Arrangement, Option [Member] |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | 1,400,000 |  | $ 1,400,000 |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  | 2 years 7 months 6 days |
Share-Based Payment Arrangement, Expense | (87,000) | $ 112,000 | $ 84,000 | $ 64,000
Service based Stock Options [Member] |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) |  |  | 11,021 | 54,530
Service based Stock Options [Member] | Maximum [Member] |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year) |  |  | 10 years |
Service based Stock Options [Member] | Minimum [Member] |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year) |  |  | 5 years |
Performance based Stock Options [Member] |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year) |  |  | 6 years |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) |  |  | 0 | 404,833
Nonvested [Member] |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period |  |  | 700,000 | 0
Share-Based Payment Arrangement, Expense | $ 394,000 | $ (169,000) | $ 394,000 | $ (156,000)
Director Plan 2004 [Member] | Share-Based Payment Arrangement, Option [Member] |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) | 3,000,000 |  | 3,000,000 |
Director Plan 2004 [Member] | Nonqualified Stock Options [Member] | Director [Member] |  |  |  |
Share Based Compensation, Arrangement By Share Based Payment Award, Options Grant, Amount |  |  | $ 100,000 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) |  |  | 1 year |
Director Plan 2004 [Member] | Nonqualified Stock Options [Member] | Director [Member] | Maximum [Member] |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year) |  |  | 10 years |
Director Plan 2004 [Member] | Nonqualified Stock Options [Member] | Director [Member] | Minimum [Member] |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year) |  |  | 3 years |
The 2006 Equity Incentive Plan [Member] | Common Stock [Member] |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) | 1,800,000 |  | 1,800,000 |

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section S45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479983/718-10-S45-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479830/718-10-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -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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