Note 18 - Industry Segment Information - Industry Segments (Details) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
		Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2019		Jun. 30, 2018		Jun. 30, 2017
Net sales		$ 209,206	$ 193,771	$ 195,522	$ 193,080	$ 203,469	$ 192,147	$ 185,694	$ 189,142	$ 791,579	[1]	$ 770,452	[1]	$ 647,885	[1]
Long-lived assets		148,024				136,934				148,024		136,934		125,112
UNITED STATES
Net sales	[1]									520,908		495,211		415,893
Long-lived assets		81,122				77,250				81,122		77,250		76,317
Asia [Member]
Net sales	[1]									108,667		108,569		86,480
Long-lived assets		35,033				30,911				35,033		30,911		30,268
EMEA [Member]
Net sales	[1],[2]									144,636		149,249		124,990
Long-lived assets	[2]	27,160				25,709				27,160		25,709		15,816
Other Geographical [Member]
Net sales	[1]									17,368		17,423		20,522
Long-lived assets		$ 4,709				$ 3,064				$ 4,709		$ 3,064		$ 2,711

[1] Net sales were identified based on geographic location where our products and services were initiated.

[2] EMEA consists primarily of Europe, Middle East and S. Africa.