Note G - Economic Dependency - Substantial Net Sales to Certain Customers (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		105 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022	Sep. 25, 2031
Net sales	$ 32,699	$ 42,373	$ 118,121	$ 118,440	$ 32,699
Customer Concentration Risk [Member] | Revenue Benchmark [Member]
Net sales	25,520	31,292	85,771	82,666
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Customer 1 [Member]
Net sales	15,962	10,673	46,948	19,795
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Customer 2 [Member]
Net sales	$ 9,558	13,846	$ 38,823	40,110
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Customer 3 [Member]
Net sales		$ 6,773		$ 22,761