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Note 8 - Income Taxes (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% |
Effective Income Tax Rate Reconciliation, Percent, Total | 1.00% | 30.00%
Deferred Tax Assets, Valuation Allowance, Total | $ 4,651 | $ 1,275
Deferred Tax Assets, Operating Loss Carryforwards, Domestic | 125,000 |
Deferred Tax Assets, Operating Loss Carryforwards, State and Local | 158,000 |
State and Local Jurisdiction [Member] |  |
Deferred Tax Assets, Valuation Allowance, Total | 4,700 | $ 1,300
Domestic Tax Authority [Member] | Pre-2018 [Member] |  |
Operating Loss Carryforwards, Total | 56,000 |
Domestic Tax Authority [Member] | Post 2017 [Member] |  |
Operating Loss Carryforwards, Total | $ 69,000 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32632-109319 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32621-109319 + Details
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- 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 http://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319 + Details
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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + Details
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