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Note 4 - Financial Instruments (Details) - Financial Instruments (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2010
Financial Instruments [Abstract]        
Cash and cash equivalents $ 66.8 $ 53.8 $ 74.2 $ 89.8
Accounts receivable 11.0 6.0    
Total financial assets 77.8 59.8    
Accounts payable 4.4 2.9    
Total financial liabilities 4.4 2.9    
Net financial assets $ 73.4 $ 56.9