Note G - Economic Dependency - Substantial Net Sales to Certain Customers (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Net sales	$ 42,373	$ 46,320	$ 118,440	$ 134,129
Customer Concentration Risk [Member] | Revenue Benchmark [Member]
Net sales	31,292	29,026	82,666	88,289
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Customer 1 [Member]
Net sales	13,846	23,215	40,110	72,001
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Customer 2 [Member]
Net sales	6,773		22,761	$ 16,288
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Customer 3 [Member]
Net sales	$ 10,673		$ 19,795
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Customer 4 [Member]
Net sales		$ 5,811