Note G - Economic Dependency - Substantial Net Purchase From Certain Suppliers (Details) - Supplier Concentration Risk [Member] - Raw Material Purchases [Member] - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018		Dec. 31, 2019		Dec. 31, 2018
Raw Material Purchases by Supplier	$ 1,734	$ 1,866		$ 3,227		$ 4,472
Supplier 1 [Member]
Raw Material Purchases by Supplier	1,734		[1]	3,227		4,472
Supplier 2 [Member]
Raw Material Purchases by Supplier		$ 1,866			[1]		[1]

[1] Purchases were less than 10% of the respective period's total raw material purchases.