Note 4 - Inventories (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Jun. 30, 2017
LIFO Inventory Amount	$ 8,500		$ 7,700
Inventory Difference Using FIFO Basis	26,300		$ 26,200
Cost of Sales [Member]
Inventory, LIFO Reserve, Effect on Income, Net	$ 100	$ 0