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Note I - Income Taxes (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Expected Proceeds from Income Tax Refunds, Carryback of Loss $ 17,400    
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00%    
Proceeds from Income Tax Refunds CARES Act $ 9,600    
Deferred Tax Assets, Valuation Allowance, Total 25,894 $ 30,841 $ 38,379
Unrecognized Tax Benefits, Ending Balance 0 0  
Deferred Tax Assets, Tax Credit Carryforwards, Research $ 215 0  
State and Local Jurisdiction [Member]      
Open Tax Year 2016 2017 2018 2019 2020 2021    
Operating Loss Carryforwards, Total $ 108,900    
Foreign Tax Authority [Member]      
Open Tax Year 2016 2017 2018 2019 2020 2021    
Operating Loss Carryforwards, Total $ 5,400    
Domestic Tax Authority [Member]      
Operating Loss Carryforwards, Total 0    
Tax Credit Carryforward, Amount 3,800    
Deferred Tax Assets, Tax Credit Carryforwards, Research 200    
Tax Year 2019 [Member]      
Proceeds from Income Tax Refunds   6,400  
Tax Year 2018 [Member]      
Proceeds from Income Tax Refunds   3,200  
Tax Year 2020 [Member]      
Expected Proceeds from Income Tax Refunds, Carryback of Loss $ 7,800 $ 7,800