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Note S - Income Taxes (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Income Tax Expense (Benefit), Total $ 0 $ 0
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total 0 $ 0
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]    
Operating Loss Carryforwards, Total 70,000  
Operating Loss Carryforwards, Subject to Expiration 55,000  
Operating Loss Carryforwards, Not Subject to Expiration $ 15,000  
Open Tax Year 2016 2017 2018 2019  
State and Local Jurisdiction [Member]    
Operating Loss Carryforwards, Total $ 3,600  
Open Tax Year 2016 2017 2018 2019