Note 6 - Inventories (Details Textual) - USD ($) $ in Millions	12 Months Ended
Jun. 30, 2018	Jun. 30, 2017
LIFO Inventory Amount	$ 8.4	$ 7.7
Inventory Difference Using FIFO Basis	24.9	26.2
Cost of Sales [Member]
Inventory, LIFO Reserve, Effect on Income, Net, Total	$ (1.3)	$ (2.6)

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