Note F - Economic Dependency - Substantial Net Sales to Certain Customers (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2017	Dec. 31, 2016
Net sales	$ 33,335	$ 30,559		$ 61,409	$ 64,626
Customer Concentration Risk [Member] | Sales Revenue, Goods, Net [Member]
Net sales	23,213	15,074		39,531	32,152
Customer Concentration Risk [Member] | Sales Revenue, Goods, Net [Member] | Customer 1 [Member]
Net sales	19,134	15,074		32,292	32,152
Customer Concentration Risk [Member] | Sales Revenue, Goods, Net [Member] | Customer 2 [Member]
Net sales	$ 4,079		[1]	$ 7,239		[1]

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