Accounting Records and Use of Estimates (Narrative) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Oct. 31, 2019	Jul. 31, 2019	Jul. 31, 2018
Operating Loss Carryforwards [Line Items]
Period over which state capital-based tax will be phased out	7 years
Unrealized gain on marketable securities reclassified to retained earnings, net of tax effect			$ 487,136
Operating lease right-of-use assets	$ 27,104,937
Operating lease liabilities	$ 17,863,507
Incremental borrowing rate	3.88%
Building and improvements net of accumulated depreciation	$ 10,200,000
Accrued rent	$ 950,000
Lease termination term	Jul. 31, 2029
Bad debt expense	$ 40,292	$ 118,238
Domestic Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards		4,002,346
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards		10,170,071
City Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards		$ 8,274,000
Minimum [Member]
Operating Loss Carryforwards [Line Items]
Lease termination term	May 31, 2029
Deferred charges amortization period	1 year
Maximum [Member]
Operating Loss Carryforwards [Line Items]
Lease termination term	Apr. 30, 2031
Deferred charges amortization period	21 years