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				6 Months Ended
	Dec. 31, 2018		Dec. 31, 2017		Dec. 31, 2018		Dec. 31, 2017
Raw Material Purchases by Supplier	$ 1,866		$ 3,402		$ 4,472		$ 5,903
Supplier 1 [Member]
Raw Material Purchases by Supplier	1,866			[1]		[1]	2,992
Supplier 2 [Member]
Raw Material Purchases by Supplier		[1]	1,684			[1]	2,911
Supplier 3 [Member]
Raw Material Purchases by Supplier		[1]	$ 1,718		$ 4,472			[1]

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