Note 2 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Revenues, net	$ 194,680	$ 184,861	$ 562,857	$ 522,341
UNITED STATES
Revenues, net	109,797	98,228	311,815	281,585
EMEA, excluding U.K. [Member]
Revenues, net	39,108	42,339	115,993	116,018
UNITED KINGDOM
Revenues, net	9,166	10,737	24,619	26,703
APAC, excluding Greater China [Member]
Revenues, net	17,193	14,943	46,982	39,990
CHINA
Revenues, net	13,781	12,993	49,655	42,727
Rest of World [Member]
Revenues, net	5,635	5,621	13,793	15,318
Consumables [Member]
Revenues, net	161,958	153,783	462,660	429,340
Instruments [Member]
Revenues, net	16,405	16,104	53,381	51,116
Service [Member]
Revenues, net	11,426	9,565	32,917	27,027
Product and Services [Member]
Revenues, net	189,789	179,452	548,958	507,483
Royalty [Member]
Revenues, net	$ 4,891	$ 5,409	$ 13,899	$ 14,858