Note 4 - Fair Value Measurements (Details Textual) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
	Mar. 31, 2017	Jun. 30, 2017	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015	Aug. 01, 2016	Mar. 14, 2016	Nov. 03, 2014
Payment for Contingent Consideration Liability		$ 28,500
Payment for Contingent Consideration Liability, Financing Activities		16,700	$ 21,060
Payment for Contingent Consideration Liability, Operating Activities		11,800
CyVek, Inc. [Member]
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High		35,000	35,000
Business Combination, Liabilities Arising from Contingencies, Amount Recognized		35,000	35,000	$ 35,000				$ 35,000
Zephyrus [Member]
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High		7,000	7,000				$ 7,000
Business Combination, Liabilities Arising from Contingencies, Amount Recognized							$ 6,500
Payment for Contingent Consideration Liability		3,500
Payment for Contingent Consideration Liability, Financing Activities	$ 3,500
Advanced Cell Diagnostics (ACD) [Member]
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High		75,000	75,000			$ 75,000
Business Combination, Liabilities Arising from Contingencies, Amount Recognized						$ 37,000
Payment for Contingent Consideration Liability		25,000
Advance Cell Diagnostics (ACD), Zephyrus, and CyVek Inc.[Member]
Business Combination, Liabilities Arising from Contingencies, Amount Recognized		$ 78,500	$ 78,500