Note G - Economic Dependency - Substantial Net Sales to Certain Customers (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Net sales	$ 37,727	$ 48,083	$ 76,067	$ 87,809
Customer Concentration Risk [Member] | Revenue Benchmark [Member]
Net sales	26,334	33,737	51,373	60,501
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Customer 1 [Member]
Net sales	12,966	24,827	26,264	48,785
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Customer 2 [Member]
Net sales	8,595	$ 8,910	15,988	$ 11,716
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Customer 3 [Member]
Net sales	$ 4,773		$ 9,121