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Note 5 - Intangible Assets (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Impairment of Intangible Assets (Excluding Goodwill) $ 0
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 900  
Finite-Lived Intangible Assets, Amortization Expense, Year Two 900  
Finite-Lived Intangible Assets, Amortization Expense, Year Three 900  
Finite-Lived Intangible Assets, Amortization Expense, Year Four 900  
Finite-Lived Intangible Assets, Amortization Expense, Year Five $ 900  
Customer Relationships [Member]    
Finite-Lived Intangible Asset, Useful Life 15 years  
Finite-Lived Intangible Assets, Remaining Amortization Period 15 years  
Impairment of Intangible Assets (Excluding Goodwill)