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Note 9 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Federal Income Tax Expense (Benefit), Continuing Operations, Total $ 0 $ 0
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00% 21.00%
Deferred Tax Assets, Operating Loss Carryforwards, Total $ 362,000  
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration 37,000  
State and Local Income Tax Expense (Benefit), Continuing Operations, Total $ 0 $ 0