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
		Sep. 30, 2018	Sep. 30, 2017
Raw Material Purchases by Supplier		$ 3,107	$ 1,967
% of Total Raw Material Purchases		15.00%	14.00%
Supplier 1 [Member]
Raw Material Purchases by Supplier		$ 3,107		[1]
% of Total Raw Material Purchases		15.00%		[1]
Supplier 2 [Member]
Raw Material Purchases by Supplier	[1]		$ 1,967
% of Total Raw Material Purchases	[1]		14.00%

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