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Note L - Business Segments and Foreign Operations - Geographic Information (Details) - USD ($) $ in Thousands | 12 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018
Net Sales | $ 302,663 | $ 240,733
Long-lived assets | 75,016 | 59,317
Reportable Geographical Components [Member] | UNITED STATES |  |
Net Sales | 132,467 | 141,705
Long-lived assets | 41,233 | 37,765
Reportable Geographical Components [Member] | NETHERLANDS |  |
Net Sales | 31,521 | 4,755
Long-lived assets | 13,186 |
Reportable Geographical Components [Member] | CHINA |  |
Net Sales | 28,772 | 11,664
Reportable Geographical Components [Member] | BELGIUM |  |
Long-lived assets | 8,595 | 7,576
Reportable Geographical Components [Member] | ITALY |  |
Net Sales | 12,755 | 12,551
Long-lived assets | 1,894 | 2,230
Reportable Geographical Components [Member] | SWITZERLAND |  |
Long-lived assets | 6,810 | 6,841
Reportable Geographical Components [Member] | AUSTRALIA |  |
Net Sales | 12,463 | 12,479
Reportable Geographical Components [Member] | CANADA |  |
Net Sales | 10,464 | 13,397
Reportable Geographical Components [Member] | Other Countries [Member] |  |
Net Sales | 74,221 | 44,182
Long-lived assets | $ 3,298 | $ 4,905

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