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Note 15 - Share-based Payments (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount $ 7,700   $ 7,700  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition     2 years 219 days  
Share-based Payment Arrangement, Expense $ 800 $ 700 $ 2,000 $ 1,900
Share-based Payment Arrangement, Amount Capitalized     $ 0 $ 0