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Note 8 - Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Federal income tax benefit at statutory rate $ (1,127) $ (945)
Adjusted for:    
AMT refundable credits (4,999)
Valuation allowance 6,111 986
Permanent differences and other 15 (41)
Income tax expense (benefit) $ 4,999 $ (4,999)