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Accumulated other comprehensive income (Tables)
3 Months Ended
Oct. 31, 2013
Accumulated other comprehensive income [Abstract]  
Schedule of accumulated other comprehensive income
  A summary of the changes in accumulated other comprehensive income for the three months ended October 31, 2013 and 2012 is as follows:

               Three Months Ended
      October 31
          2013       2012
      (Unaudited)   (Unaudited)
  Beginning balance, net of tax effect   $ 183,633     $ 133,477  
   
  Other comprehensive income, net of tax effect:                
         Unrealized gains on available-for-sale securities     20,269       22,396  
         Tax effect          (9,000 )     (9,000 )
         Unrealized gains on available-for-sale securities,                
                net of tax effect     11,269       13,396  
  Amounts reclassified from accumulated other                
         comprehensive income, net of tax effect:                
         Unrealized gains on available-for-sale securities reclassified          (155,187 )     -  
         Tax effect          69,000       -  
                Amounts reclassified, net of tax effect          (86,187 )     -  
   
  Ending balance, net of tax effect   $ 108,715     $      146,873