Note K - Economic Dependency - Substantial Net Sales to Certain Customers (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Net sales	$ 178,520	$ 118,876
Customer Concentration Risk [Member] | Revenue Benchmark [Member]
Net sales	116,230	77,154
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Customer 1 [Member]
Net sales	90,820	52,462
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Customer 2 [Member]
Net sales	$ 25,410	$ 24,692