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Note 8 - Income Taxes (Details Textual) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2020 | Dec. 31, 2021
Deferred Tax Assets, Valuation Allowance | $ 59,398 |  | $ 67,525
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | (8,100) |  |
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities |  | $ 2,500 |
Unrecognized Tax Benefits that Would Impact Effective Tax Rate |  | $ 2,000 |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total |  |  | $ 0
Domestic Tax Authority [Member] |  |  |
Operating Loss Carryforwards | $ 906,200 |  |
Open Tax Year | 2011 2012 2013 2020 |  |

X
- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319 + Details
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- 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 -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (e) -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32718-109319 + Details
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- Definition Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32718-109319 + Details
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