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Note 6 - Goodwill (Details Textual) - USD ($)
9 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Goodwill, Ending Balance $ 164,774,000 $ 159,791,000
Goodwill, Impairment Loss $ 0  
Percentage of Estimate Fair Value Exceeded Carrying Value of Reporting Unit 12.00%  
Goodwill Impairment Test, Discount Rate 12.50%  
Goodwill Impairment Test, Risk of Impairment Loss $ 159,790