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Consolidated Balance Sheets (Parentheticals) - $ / shares
None in scaling factor is -9223372036854775296
Jun. 30, 2015
Mar. 31, 2015
Statement of Financial Position [Abstract]    
Preferred stock, no par value (in dollars per share)    
Preferred stock, shares authorized 5,000,000 5,000,000
Preferred stock, shares issued    
Common stock, no par value (in dollars per share)    
Common stock, shares authorized 50,000,000 50,000,000
Common stock, shares issued 12,422,085 12,415,785
Common stock, shares outstanding 7,708,281 7,701,981
Treasury stock, shares 4,713,804 4,713,804