Note 5 - Acquisition (Detail) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended					21 Months Ended
	Sep. 30, 2011 USD ($)	Dec. 31, 2012 USD ($)	Feb. 29, 2012 USD ($)	Feb. 29, 2012 AUD	Dec. 31, 2011 USD ($)	Dec. 31, 2011 AUD	Dec. 31, 2012 USD ($)
Business Acquisition, Cost of Acquired Entity, Cash Paid		$ 53.0	$ 11.9	11.9	$ 28.8	27.2	$ 53.0
Business Acquisition, Contingent Consideration, Potential Cash Payment		4.3					4.3
Earn Out Period		2 years	1 year	1 year	1 year	1 year
Anticipated Post Closing Payments To Seller Under Terms Of Agreement		4.3					14.8
Anticipated Post Closing Payments Paid	$ 2.9	$ 11.9