Note 6 - Inventories (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
LIFO Inventory Amount	$ 7.7	$ 10.5
Inventory Difference Using FIFO Basis	26.2	28.8
Cost of Sales [Member]
Inventory, LIFO Reserve, Effect on Income, Net	$ (2.6)	$ 0.8