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Note 7 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Deferred Tax Assets, Valuation Allowance, Total $ 67,525 $ 50,548
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount 17,000  
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 $ 0
Domestic Tax Authority [Member]    
Tax Credit Carryforward, Amount 15,300  
Operating Loss Carryforwards, Total $ 1,200,000  
Open Tax Year 2011 2012 2013 2020