Note 2 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Revenues, net	$ 174,510	$ 154,153	$ 337,480	$ 298,766
UNITED STATES
Revenues, net	92,902	80,600	183,358	160,411
EMEA, excluding U.K. [Member]
Revenues, net	38,446	36,374	73,677	67,764
UNITED KINGDOM
Revenues, net	8,838	8,188	15,967	15,112
APAC, excluding Greater China [Member]
Revenues, net	13,418	11,843	25,047	23,332
CHINA
Revenues, net	16,312	13,192	29,734	23,909
Rest of World [Member]
Revenues, net	4,594	3,956	9,697	8,238
Consumables [Member]
Revenues, net	139,904	125,646	275,557	245,748
Instruments [Member]
Revenues, net	19,666	17,565	35,012	30,850
Service [Member]
Revenues, net	9,162	8,660	17,462	17,038
Product and Services [Member]
Revenues, net	168,732	151,871	328,031	293,636
Royalty [Member]
Revenues, net	$ 5,778	$ 2,282	$ 9,449	$ 5,130