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Marketable Securities (Tables)
9 Months Ended
Apr. 30, 2015
Marketable Securities: [Abstract]  
Schedule of financial assets measured at fair value on recurring basis

Fair value measurements at reporting date using

Description   Total
April 30,
2015
  Level 1   Level 2   Level 3   Total
July 31,
2014
  Level 1   Level 2   Level 3
Assets:                                
Marketable securities -                
       available-for-sale   $ 1,477,072   $ 1,477,072   $   $   $ 1,354,213   $ 1,354,213   $   $
Schedule of investments measured at fair value
April 30, 2015 Fair Value   Unfunded
Commitments
  Redemption Frequency
(if currently eligible)
  Redemption
Notice Period
First Eagle Global CL I $ 280,717   n/a   Daily   None
Parnasus Core Equity Investor CL $ 297,992   n/a   Daily   None
Columbia Flexible Income CL A $ 278,822   n/a   Daily   None
 
July 31, 2014   Fair Value   Unfunded
Commitments
  Redemption Frequency
(if currently eligible)
  Redemption
Notice Period
First Eagle Global CL I   $ 273,000   n/a   Daily   None
Parnasus Core Equity Investor CL $ 277,571   n/a   Daily   None
Transamerica Tactical Income CL A   $ 269,649   n/a   Daily   None
Schedule of classified marketable securities
  April 30, 2015   July 31, 2014
  Cost   Gross
Unrealized
Gains
  Gross
Unrealized
Losses
  Fair
Value
  Cost   Gross
Unrealized
Gains
  Gross
Unrealized
Losses
  Fair
Value
Noncurrent:                            
Available-for-sale:                
       Mutual funds   $ 716,050   $ 141,481   $   $ 857,531   $ 691,047   $ 129,173   $   $ 820,220
       Equity securities   440,902   178,639     619,541   426,754   107,239     533,993
  $ 1,156,952   $ 320,120   $   $ 1,477,072   $ 1,117,801   $ 236,412   $   $ 1,354,213
Schedule of investment income
  Three Months Ended
April 30
  Nine Months Ended
April 30
  2015   2014   2015   2014
Gain on sale of marketable securities   $ 6,069   $   $ 6,455   $ 182,846
Interest income   860   529   2,147   1,825
Dividend income   6,596   6,162   37,467   42,409
       Total   $ 13,525   $ 6,691   $ 46,069   $ 227,080