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Note 12 - Segment Information - Financial Information Relating to Geographic Areas (Details) - USD ($) | 12 Months Ended
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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

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