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Cash Flow Information
 9 Months Ended
Apr. 30, 2014
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
      2014        2013
  Interest paid, net of capitalized interest of $11,100 (2014)                   
         and $15,217 (2013)   $       326,817     $       325,080
   
  Income taxes paid (refunded)   $ (14,417 )   $ 594,382