Note 17 - Industry Segment Information - Industry Segments (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
Net sales		$ 227,508	$ 216,743	$ 209,751	$ 214,379	$ 217,089	$ 184,715	$ 173,854	$ 179,600	$ 868,382	[1]	$ 755,258	[1]	$ 751,586	[1]
Long-lived assets		144,570				133,160				144,570		133,160		106,686
UNITED STATES
Net sales	[1]									593,141		523,266		548,058
Long-lived assets		84,887				84,365				84,887		84,365		76,545
Asia [Member]
Net sales	[1]									108,569		86,480		70,269
Long-lived assets		30,910				30,268				30,910		30,268		7,035
EMEA [Member]
Net sales	[1],[2]									149,249		124,990		107,765
Long-lived assets	[2]	25,709				15,816				25,709		15,816		17,287
Other Geographical [Member]
Net sales	[1]									17,423		20,522		25,494
Long-lived assets		$ 3,064				$ 2,711				$ 3,064		$ 2,711		$ 5,819

[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.