Note 2 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Revenues, net	$ 184,861	$ 163,973	$ 522,341	$ 462,739
UNITED STATES
Revenues, net	98,228	86,447	281,585	246,857
EMEA, excluding U.K. [Member]
Revenues, net	42,339	39,318	116,018	107,082
UNITED KINGDOM
Revenues, net	10,737	9,164	26,703	24,276
APAC, excluding Greater China [Member]
Revenues, net	14,943	13,107	39,990	36,439
CHINA
Revenues, net	12,993	11,097	42,727	35,006
Rest of World [Member]
Revenues, net	5,621	4,840	15,318	13,079
Consumables [Member]
Revenues, net	153,783	139,416	429,340	385,164
Instruments [Member]
Revenues, net	16,104	13,197	51,116	44,047
Service [Member]
Revenues, net	9,565	8,362	27,027	25,400
Product and Services [Member]
Revenues, net	179,452	160,975	507,483	454,611
Royalty [Member]
Revenues, net	$ 5,409	$ 2,998	$ 14,858	$ 8,128