Note 12 - Segment Information - Financial Information Relating to Geographic Areas (Details) - USD ($)	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
UNITED STATES
External sales	$ 283,270,000	$ 245,217,000	$ 190,359,000
UNITED KINGDOM
External sales	88,680,000	68,055,000	55,144,000
Europe Other than U.K. [Member]
External sales	51,047,000	66,022,000	42,013,000
CHINA
External sales	27,205,000	26,105,000	18,878,000
Long-lived assets	1,109,000	1,286,000	678,000
Other Asia [Member]
External sales	24,809,000	23,806,000	32,704,000
Rest of World [Member]
External sales	24,012,000	23,041,000	18,665,000
United States and Canada [Member]
Long-lived assets	118,027,000	119,075,000	109,790,000
Europe [Member]
Long-lived assets	14,423,000	11,239,000	8,340,000
External sales	499,023,000	452,246,000	357,763,000
Long-lived assets	$ 133,559,000	$ 131,600,000	$ 118,808,000