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Note 15 - Income Taxes (Details Textual) - USD ($) Pure in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Effective Income Tax Rate Reconciliation, Percent, Total | 0.00% | 0.00%
Deferred Tax Assets, Valuation Allowance | $ 104,361 | $ 95,256
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | 9,105 |
Deferred Tax Assets, Operating Loss Carryforwards, Domestic | 257,535 |
Deferred Tax Assets, Operating Loss Carryforwards, State and Local | 173,657 |
Deferred Tax Assets, Operating Loss Carryforwards, Foreign | $ 70,922 |
Federal Net Operating Loss Carryforwards, Expiration Period Minimum (Year) | 5 years |
Federal Tax Credit CarryForward, Expiration Period, Maximum (Year) | 20 years |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, Total | $ 0 | $ 0
State Tax Credit Carry Forward, Expiration Period, Minimum (Year) | 5 years |
Foreign Tax Credit Carry Forward, Expiration Period, Minimum (Year) | 5 years |
Domestic Tax Jurisdiction [Member] |  |
Open Tax Year | 2021 2022 2023 |
Domestic Tax Jurisdiction [Member] | Research Tax Credit Carryforward [Member] |  |
Tax Credit Carryforward, Amount | $ 14,746 |
State and Local Jurisdiction [Member] |  |
Open Tax Year | 2021 2022 2023 |
Foreign Tax Jurisdiction [Member] |  |
Open Tax Year | 2023 |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible domestic operating loss carryforwards. Excludes state and local operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-6 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible foreign operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-6 + Details
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