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Consolidated Balance Sheets (Parentheticals) - $ / shares
Jun. 30, 2016
Jun. 30, 2015
Statement of Financial Position [Abstract]    
Preferred stock, par value (in dollars per share) $ 0 $ 0
Preferred stock, shares authorized (in shares) 2,500,000 2,500,000
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Common stock, par value (in dollars per share) $ 0 $ 0
Common stock, shares outstanding (in shares) 20,627,511 20,743,973
Common stock, shares authorized (in shares) 75,000,000 75,000,000
Common stock, shares issued (in shares) 21,811,153 21,864,548
Treasury stock, shares at cost (in shares) 1,183,642 1,120,575