Note F - 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, 2019		Mar. 31, 2018		Mar. 31, 2019		Mar. 31, 2018
Raw Material Purchases by Supplier			$ 2,076		$ 6,312		$ 5,068
Supplier 1 [Member]
Raw Material Purchases by Supplier		[1]		[1]	6,312			[1]
Supplier 2 [Member]
Raw Material Purchases by Supplier		[1]	$ 2,076			[1]	$ 5,068

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