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Note 9 - Income Taxes (Details Textual) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% | 21.00% | 21.00% |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | $ 23,300 | $ 17,800 |  |
Unrecognized Tax Benefits | 8,413,000 | $ 6,496,000 | $ 5,001,000 | $ 4,500,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 0 |  |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued | $ 0 |  |  |
Open Tax Year | 2019 2020 2021 2022 |  |  |
Domestic Tax Authority [Member] |  |  |  |
Operating Loss Carryforwards | $ 158,700,000 |  |  |
Domestic Tax Authority [Member] | Research Tax Credit Carryforward [Member] |  |  |  |
Tax Credit Carryforward, Amount | 21,100,000 |  |  |
Domestic Tax Authority [Member] | Carryforward Subject to Expiration [Member] |  |  |  |
Operating Loss Carryforwards | 74,100,000 |  |  |
Domestic Tax Authority [Member] | Indefinite Life Carryforwards [Member] |  |  |  |
Operating Loss Carryforwards | $ 84,600,000 |  |  |

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-12 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.Fact.4) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479360/740-10-S99-1 + Details
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