Note F - Economic Dependency - Substantial Net Purchase From Certain Supplier (Details) - Supplier Concentration Risk [Member] - Raw Material Purchases [Member] - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Mar. 31, 2018		Mar. 31, 2017	Mar. 31, 2018		Mar. 31, 2017	[1]
Raw Material Purchases by Supplier	$ 2,076		$ 4,646	$ 5,068
Supplier 1 [Member]
Raw Material Purchases by Supplier	2,076		1,317	5,068
Supplier 2 [Member]
Raw Material Purchases by Supplier		[1]	1,683		[1]
Supplier 3 [Member]
Raw Material Purchases by Supplier		[1]	$ 1,646		[1]

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