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Note G - Economic Dependency - Substantial Net Sales to Certain Customers (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Net sales	$ 29,195	$ 36,532
Customer Concentration Risk [Member] \| Revenue Benchmark [Member]
Net sales	21,549	24,807
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Customer 1 [Member]
Net sales	14,354	21,078
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Customer 2 [Member]
Net sales	3,970	$ 3,729
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Customer 3 [Member]
Net sales	$ 3,225