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Note 20 - Income Taxes - Components of Income Tax Expense (Benefit) Applicable to Continuing Operations (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Current:    
Federal $ (184,000) $ 0
State 39,000 222,000
Foreign 194,000 79,000
Total current income tax expense 49,000 301,000
Deferred:    
Federal (600,000) 0
State (67,000) 0
Foreign 0 0
Total deferred income tax (benefit) expense (667,000) 0
Income tax (benefit) expense, net $ (618,000) $ 301,000