CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	9 Months Ended
	Apr. 30, 2017	Apr. 30, 2016
Cash Flows From Operating Activities:
Net income	$ 1,391,821	$ 1,075,492
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	1,253,091	1,223,036
Amortization of deferred charges	200,900	238,804
Deferred finance costs included in interest expense	17,154	17,100
Realized (gain) loss on sale of marketable securities	(23,734)	36,999
Gain on disposition of property and equipment		(500)
Other assets - unbilled receivables	160,661	288,034
Other assets - deferred charges	(366,995)	(63,105)
Deferred income taxes	706,000	497,000
Deferred revenue	(875,001)	(875,001)
Changes in:
Receivables	153,645	457,070
Income taxes refundable	(5,608)	162,399
Prepaid expenses	687,443	603,501
Accounts payable	15,757	56,361
Payroll and other accrued liabilities	136,675	(588,570)
Other taxes payable	(1,563)	(1,536)
Cash provided by operating activities	3,450,246	3,127,084
Cash Flows From Investing Activities:
Capital expenditures	(1,635,496)	(2,254,034)
Security deposits	(134,846)	(34,560)
Marketable securities:
Receipts from sales or maturities	282,434	314,008
Payments for purchases	(839,970)	(338,436)
Cash (used) by investing activities	(2,327,878)	(2,313,022)
Cash Flows From Financing Activities:
Increase - security deposits	134,846	32,261
Mortgage and other debt payments	(1,116,961)	(112,274)
Cash (used) by financing activities	(982,115)	(80,013)
Increase in cash and cash equivalents	140,253	734,049
Cash and cash equivalents at beginning of period	5,228,826	4,085,704
Cash and cash equivalents at end of period	$ 5,369,079	$ 4,819,753