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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
 6 Months Ended
Jan. 31, 2016
Jan. 31, 2015
Cash Flows From Operating Activities:    
Net income $ 624,101 $ 767,585
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 814,150 884,807
Amortization of deferred charges 170,079 181,870
Realized (gain) loss on sale of marketable securities 38,538 (386)
Other assets - unbilled receivables 192,022 (17,813)
- deferred charges (42,070) (414,970)
Deferred income taxes 322,000 353,000
Deferred revenue (583,334) (583,334)
Changes in:    
Receivables (51,407) $ (40,394)
Real estate tax refundable (16,474)
Income taxes refundable 97,399 $ (68,926)
Prepaid expenses 12,851 (21,586)
Accounts payable 60,433 (50,343)
Payroll and other accrued liabilities (35,620) 207,873
Other taxes payable 6,028 4,320
Cash provided by operating activities 1,608,696 1,201,703
Cash Flows From Investing Activities:    
Capital expenditures (1,256,843) (871,925)
Security deposits 78,908 39,262
Marketable securities:    
Receipts from sales or maturities 238,663 270,974
Payments for purchases (65,613) (302,246)
Cash (used) by investing activities (1,004,885) (863,935)
Cash Flows From Financing Activities:    
Increase - security deposits $ (81,007) 20,107
Increase - mortgage debt 652,274
Mortgage and other debt payments $ (74,127) (73,609)
Cash provided (used) by financing activities (155,134) 598,772
Increase in cash and cash equivalents 448,677 936,540
Cash and cash equivalents at beginning of period 4,085,704 1,892,760
Cash and cash equivalents at end of period $ 4,534,381 $ 2,829,300