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Note 7 - Income Taxes (Details Textual) - USD ($) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2023 | Dec. 31, 2022
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | $ 5,300,000 | $ 5,300,000
Unrecognized Tax Benefits, Interest on Income Taxes Accrued | $ 302,000 | $ 302,000
Domestic Tax Authority [Member] |  |
Open Tax Year | 2019 2020 2021 2022 |
State and Local Jurisdiction [Member] |  |
Open Tax Year | 2018 2019 2020 2021 2022 |

X
- Definition Tax year that remains open to examination under enacted tax laws, in YYYY format. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-15 + Details
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- Definition Amount of interest expense accrued for an underpayment of income taxes. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-15 + Details
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- Definition The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-15A + Details
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