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Note 10 - Income Taxes - Components of the Income Tax Provision (Benefit) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current:      
Federal $ 252 $ 12 $ 313
State 365 84 (38)
Components of the Income Tax Provision, Current Total 617 96 275
Deferred:      
Federal 2,067 983 789
State 191 128 294
Components of the Income Tax Provision, Deferred Total 2,258 1,111 1,083
Income tax expense $ 2,875 $ 1,207 $ 1,358