Note 3 - Inventories (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			3 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012	Mar. 31, 2013 Previously Unrecognized LIFO Income [Member] Pre-Tax Amounts [Member]	Mar. 31, 2013 After-tax [Member]
Note 3 - Inventories (Details) [Line Items]
LIFO Inventory Amount	$ 45.9		$ 46.7
Percentage of LIFO Inventory	18.70%		16.10%
Inventory, LIFO Reserve, Effect on Income, Net				1.9	1.2
Inventory, LIFO Reserve, Period Charge	0.2	0.4
Inventory Difference Using FIFO Basis	$ 2.5