Note F - Economic Dependency - Substantial Net Sales to Certain Customers (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Mar. 31, 2017		Mar. 31, 2016	Mar. 31, 2017		Mar. 31, 2016
Net Sales by Customer	$ 25,135		$ 30,006	$ 89,761		$ 78,502
Sales Revenue, Goods, Net [Member] | Customer Concentration Risk [Member]
Net Sales by Customer	11,046		19,586	43,198		41,419
Sales Revenue, Goods, Net [Member] | Customer Concentration Risk [Member] | Customer 1 [Member]
Net Sales by Customer	11,046		13,023	43,198		31,714
Sales Revenue, Goods, Net [Member] | Customer Concentration Risk [Member] | Customer 2 [Member]
Net Sales by Customer		[1]	3,367		[1]	9,705
Sales Revenue, Goods, Net [Member] | Customer Concentration Risk [Member] | Customer 3 [Member]
Net Sales by Customer		[1]	$ 3,196		[1]		[1]

[1] Sales were less than 10% of the respective period's total private revenues.