Note 16 - Income Taxes (Details Textual) - USD ($) |
12 Months Ended | |
|---|---|---|
Dec. 31, 2024 |
Dec. 31, 2023 |
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| Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | $ 4.9 | |
| Capitalized Research and Development Expenditures | 3,500,000 | $ 3,600,000 |
| Unrecognized Tax Benefits | 500,000 | |
| Domestic Tax Jurisdiction [Member] | Internal Revenue Service (IRS) [Member] | ||
| Operating Loss Carryforwards | 190,900,000 | |
| Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration | 25,200,000 | |
| Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration | 165,700,000 | |
| Tax Credit Carryforward, Amount | $ 600,000 | |
| Open Tax Year | 2021 2022 2023 | |
| State and Local Jurisdiction [Member] | California Franchise Tax Board [Member] | ||
| Operating Loss Carryforwards | $ 4.1 | |
| Tax Credit Carryforward, Amount | $ 500,000 | |
| Open Tax Year | 2021 2022 2023 |
| X | ||||||||||
- Definition The amount of capitalized research and development expenditures. No definition available.
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards that are not subject to expiration dates. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards that are subject to expiration dates. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Tax year that remains open to examination under enacted tax laws, in YYYY format. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of unrecognized tax benefits. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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