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Consolidated Balance Sheets (Parentheticals) - $ / shares
Sep. 30, 2015
Mar. 31, 2015
Statement of Financial Position [Abstract]    
Preferred stock, no par value (in dollars per share) $ 0 $ 0
Preferred stock, shares authorized 5,000,000 5,000,000
Preferred stock, shares issued 0 0
Common stock, no par value (in dollars per share) $ 0 $ 0
Common stock, shares authorized 50,000,000 50,000,000
Common stock, shares issued 12,430,785 12,415,785
Common stock, shares outstanding 7,716,981 7,701,981
Treasury stock, shares 4,713,804 4,713,804