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Note 3 - Investment (Details Textual) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2013
Jun. 26, 2010
Aug. 31, 2011
Future Investment in Equity Method Investment       $ 1.5  
Equity Method Investment, Ownership Percentage       36.00%  
Income (Loss) from Equity Method Investments $ 0.2 $ 0.3 $ 0.5    
Equity Method Investments $ 2.1 $ 1.9      
Guarantor Obligations, Current Carrying Value         $ 0.5