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Cash Flow Information
9 Months Ended
Apr. 30, 2015
Cash Flow Information: [Abstract]  
Cash Flow Information:
10. Cash Flow Information:
        
For purposes of reporting cash flows, the Company considers cash equivalents to consist of short-term highly liquid investments with maturities of three (3) months or less, which are readily convertible into cash.
 
Supplemental disclosure:   Nine Months Ended
  April 30
  2015   2014
Interest paid, net of capitalized interest of $6,367 (2015)        
       and $11,100 (2014)   $ 280,522   $ 326,817
Income taxes paid (refunded)   $ 387,163   $ (14,417 )
   
Non-cash investing and financing activities:    
       Refinancing of mortgage payable   $ 5,347,726   $