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Note 16 - Income Taxes - Summary of Components of Income Tax Expense for Continuing Operations (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current:      
Federal $ (454) $ (740) $ (5,076)
State 49 (102) 35
Total current income tax benefit (405) (842) (5,041)
Deferred:      
Federal (766) (2,883) (5,524)
State 71 (373) 2,042
Total deferred income tax benefit (695) (3,256) (3,482)
Income tax benefit $ (1,100) $ (4,098) $ (8,523)