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Note 3 - Business Combinations, Goodwill and Intangible Assets (Details Textual) - USD ($)
3 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Goodwill, Period Increase (Decrease)     $ (12,724,000)  
Goodwill   $ 0 12,724,000  
Goodwill, Impairment Loss $ 12,724,000 12,724,000
Amortization of Intangible Assets   $ 932,000 $ 1,121,000 $ 1,258,000