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			9 Months Ended
	Mar. 31, 2020	Mar. 31, 2019		Mar. 31, 2020		Mar. 31, 2019
Raw Material Purchases by Supplier	$ 1,930					$ 6,312
Supplier 1 [Member]
Raw Material Purchases by Supplier	1,930		[1]		[1]		[1]
Supplier 2 [Member]
Raw Material Purchases by Supplier			[1]		[1]	$ 6,312	[1]

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