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Note 13 - Stock-Based Compensation and Purchase Plans (Details) - Assumptions Used to Estimate Fair Values - $ / shares
12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2013
Assumptions Used to Estimate Fair Values [Abstract]      
Risk-free interest rates 0.88% 0.70% 0.25%
Expected life of option grants (in years) 3 years 3 years 3 years
Expected volatility of underlying stock 32.00% 38.90% 47.40%
Expected quarterly dividends (per share) (in Dollars per share) $ 0.10 $ 0.08 $ 0.07