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Note 2 - Acquisition of JSI Store Fixtures - Pro Forma Information (Details) - JSI Store Fixtures [Member] - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2021 | Jun. 30, 2020
Net sales |  | $ 391,000 | $ 362,541
Gross profit |  | 97,947 | 86,399
Operating income | $ 19,300 | $ 19,312 | $ 13,878

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