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Note 8 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Elimination of AMT Operating Loss Carryforwards     $ 91,300
Income Tax Expense (Benefit), Total $ 4,999 $ (5,000)
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00% 21.00%  
Operating Loss Carryforwards that Do Not Expire $ 5,200    
Domestic Tax Authority [Member]      
Operating Loss Carryforwards, Total 71,700    
State and Local Jurisdiction [Member]      
Operating Loss Carryforwards, Total $ 85,700