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Note 11 - Income Taxes - Components of the Income Tax Provision (Benefit) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Current:      
Federal $ 447 $ 252 $ 12
State 708 365 84
Components of the Income Tax Provision, Current Total 1,155 617 96
Deferred:      
Federal 148 2,067 983
State (413) 191 128
Components of the Income Tax Provision, Deferred Total (265) 2,258 1,111
Income tax expense (benefit) $ 890 $ 2,875 $ 1,207