Note 16 - Quarterly Consolidated Financial Data (Unaudited) (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability Including Earnout Payable	$ 2,828	$ 3,057	$ (710)	$ 1,726