Note G - Economic Dependency - Substantial Net Sales to Certain Customers (Details) - USD ($) $ in Thousands	3 Months Ended
Sep. 30, 2021	Sep. 30, 2020
Net sales	$ 38,340	$ 39,726
Customer Concentration Risk [Member] \| Revenue Benchmark [Member]
Net sales	29,358	23,958
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Customer 1 [Member]
Net sales	13,296	$ 23,958
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Customer 2 [Member]
Net sales	7,386
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Customer 3 [Member]
Net sales	4,349
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Customer 4 [Member]
Net sales	$ 4,327

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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+ Details