Note 4 - Inventories (Details Textual) - USD ($) $ in Millions	9 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Jun. 30, 2016
LIFO Inventory Amount	$ 7.2		$ 10.5
Inventory Difference Using FIFO Basis	27.3		$ 28.8
Cost of Sales [Member]
Inventory, LIFO Reserve, Effect on Income, Net	$ 1.5	$ 0.3