Note 11 - Segment Information - Financial Information Relating to Geographic Areas (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
External sales	$ 180,254	$ 163,973	$ 154,153	$ 144,613	$ 156,578	$ 144,037	$ 131,807	$ 130,581	$ 642,993	$ 563,003	$ 499,023
Long-lived assets	145,348				135,124				145,348	135,124	132,362
Intangible assets, net	446,332				452,042				446,332	452,042	310,524
UNITED STATES
External sales									346,293	313,195	275,859
EMEA, excluding U.K. [Member]
External sales									148,599	125,126	103,060
United States and Canada [Member]
Long-lived assets	129,360				119,859				129,360	119,859	116,830
Intangible assets, net	417,430				424,579				417,430	424,579
UNITED KINGDOM
External sales									33,704	28,401	28,307
Europe [Member]
Long-lived assets	14,597				14,100				14,597	14,100	14,423
Intangible assets, net	21,386				18,710				21,386	18,710
APAC, excluding Greater China [Member]
External sales									48,392	41,463	38,137
CHINA
External sales									47,950	39,078	36,199
Long-lived assets	1,391				1,165				1,391	1,165	1,109
Intangible assets, net	$ 7,516				$ 8,753				7,516	8,753
Rest of World [Member]
External sales									$ 18,055	$ 15,740	$ 17,461