Note 4 - Fair Value Measurements (Details Textual) - USD ($) $ in Thousands	6 Months Ended	7 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability and Earnout Payable			$ 6,901	$ 6,976
Ambrell [Member]
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability and Earnout Payable	$ 6,976	$ 6,976	$ 6,901