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Note 6 - Income Taxes (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Operating Loss Carryforwards $ 41,000 $ 42,100
Operating Loss Carryforwards, Expiration Date Dec. 31, 2028  
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount $ 32  
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00% 21.00%