Note 4 - Inventories (Details Textual) - USD ($) $ in Millions	9 Months Ended
Mar. 31, 2018	Mar. 31, 2017	Jun. 30, 2017
LIFO Inventory Amount	$ 8.4		$ 7.7
Inventory Difference Using FIFO Basis	26.0		$ 26.2
Cost of Sales [Member]
Inventory, LIFO Reserve, Effect on Income, Net, Total	$ 0.2	$ 1.5

The amount of LIFO (last in first out) inventory present at the reporting date when inventory is also valued using different valuation methods.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6361739&loc=d3e7789-107766

Name:	us-gaap_LIFOInventoryAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant