Note 2 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Revenues, net	$ 184,934	$ 174,510	$ 368,177	$ 337,480
UNITED STATES
Revenues, net	99,665	92,902	202,017	183,358
EMEA, excluding U.K. [Member]
Revenues, net	38,081	38,446	76,885	73,677
UNITED KINGDOM
Revenues, net	7,865	8,838	15,454	15,967
APAC, excluding Greater China [Member]
Revenues, net	15,784	13,418	29,789	25,047
CHINA
Revenues, net	19,793	16,312	35,873	29,734
Rest of World [Member]
Revenues, net	3,746	4,594	8,159	9,697
Consumables [Member]
Revenues, net	149,257	139,904	300,702	275,557
Instruments [Member]
Revenues, net	19,983	19,666	36,976	35,012
Service [Member]
Revenues, net	10,868	9,162	21,491	17,462
Product and Services [Member]
Revenues, net	180,108	168,732	359,168	328,031
Royalty [Member]
Revenues, net	$ 4,826	$ 5,778	$ 9,009	$ 9,449