CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	6 Months Ended
	Jan. 31, 2017	Jan. 31, 2016
Cash Flows From Operating Activities
Net income	$ 785,587	$ 624,101
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	829,300	814,150
Amortization of deferred charges	130,700	158,679
Deferred finance costs included in interest expense	11,436	11,400
Realized loss on sale of marketable securities	7,421	38,538
Other assets - unbilled receivables	179,610	192,022
Other assets - deferred charges	(88,446)	(42,070)
Deferred income taxes	397,000	322,000
Deferred revenue	(583,334)	(583,334)
Changes in:
Receivables	39,894	(51,407)
Real estate tax refundable		(16,474)
Income taxes refundable	3,299	97,399
Prepaid expenses	(484)	12,851
Accounts payable	29,055	60,433
Payroll and other accrued liabilities	255,913	(35,620)
Other taxes payable	6,937	6,028
Cash provided by operating activities	2,003,888	1,608,696
Cash Flows From Investing Activities
Capital expenditures	(1,081,210)	(1,256,843)
Security deposits	(4,151)	78,908
Marketable securities:
Receipts from sales or maturities	115,173	238,663
Payments for purchases	(167,208)	(65,613)
Cash (used) by investing activities	(1,137,396)	(1,004,885)
Cash Flows From Financing Activities
Increase - security deposits	4,152	(81,007)
Mortgage and other debt payments	(1,076,875)	(74,127)
Cash (used) by financing activities	(1,072,723)	(155,134)
Increase (decrease) in cash and cash equivalents	(206,231)	448,677
Cash and cash equivalents at beginning of period	5,228,826	4,085,704
Cash and cash equivalents at end of period	$ 5,022,595	$ 4,534,381