Note J - Economic Dependency - Substantial Net Sales to Certain Customers (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2017		Jun. 30, 2016
Net sales	$ 121,946		$ 114,201
Customer Concentration Risk [Member] | Sales Revenue, Goods, Net [Member]
Net sales	60,532		63,394
Customer Concentration Risk [Member] | Sales Revenue, Goods, Net [Member] | Customer 1 [Member]
Net sales	60,532		49,442
Customer Concentration Risk [Member] | Sales Revenue, Goods, Net [Member] | Customer 2 [Member]
Net sales		[1]	$ 13,952

[1] Sales were less than 10% of the respective period's consolidated net sales.