Note J - Economic Dependency - Substantial Net Sales to Certain Customers (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Net sales	$ 132,437	$ 121,946
Customer Concentration Risk [Member] | Sales Revenue, Goods, Net [Member]
Net sales	88,230	60,532
Customer Concentration Risk [Member] | Sales Revenue, Goods, Net [Member] | Customer 1 [Member]
Net sales	74,349	60,532
Customer Concentration Risk [Member] | Sales Revenue, Goods, Net [Member] | Customer 2 [Member]
Net sales	$ 13,881		[1]

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