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Note 13 - Stock-based compensation and purchase plans (Details) - Assumptions used to estimate fair values (USD $)
12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2011
Assumptions used to estimate fair values [Abstract]      
Risk-free interest rates 0.25% 0.25% 0.68%
Expected life of option grants (in years) 3 years 3 years 3 years
Expected volatility of underlying stock 47.40% 63.20% 65.40%
Expected quarterly dividends (per share) (in Dollars per share) $ 0.07 $ 0.06 $ 0.05