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Note 3 - Acquisition of JSI Store Fixtures - Pro Forma Information (Details) - JSI Store Fixtures [Member] - USD ($) $ in Thousands | 12 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020
Net sales | $ 391,000 | $ 362,541
Gross profit | 97,947 | 86,399
Operating income | $ 19,312 | $ 13,878

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