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Note 2 - Business Segment Information - Revenue by Geographic Region (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2013
Inter-segment Revenues |  | $ 83,419 | $ 78,156 | $ 85,658 | $ 84,159 | $ 80,844 | $ 70,740 | $ 84,687 | $ 85,925 | $ 76,073 | $ 68,603 | $ 84,715 | $ 78,466 | $ 331,392 | [1] | $ 322,196 | [1] | $ 307,857 | [1] | $ 299,463 | $ 280,790
UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Inter-segment Revenues | [1] |  |  |  |  |  |  |  |  |  |  |  |  | 331,392 |  | 322,196 |  | 307,816 |  |  |
CANADA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Inter-segment Revenues | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 41 |  |  |
[1] | Net sales are attributed to geographic areas based upon the location of the operation making the sale.

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