The Impact of COVID-19 on our Results and Operations (Narrative) (Details) - USD ($)	6 Months Ended		12 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jul. 31, 2019	Jul. 31, 2020
Operating Loss Carryforwards [Line Items]
Allowance for Expected uncolllectible receivables	$ 156,000			$ 82,000
Period over which state capital-based tax will be phased out	7 years
Operating lease right-of-use assets		$ 29,384,531	$ 27,100,000
Operating lease liabilities		20,143,101	$ 17,900,000
Incremental borrowing rate			3.88%
Building and improvements net of accumulated depreciation			$ 10,200,000
Accrued rent			$ 950,000
Lease termination term			Jul. 31, 2030
Rent abatements	$ 9,487			433,517
Amount of Deferrals	125,000			459,429
Fishkill, NY building [Member]
Operating Loss Carryforwards [Line Items]
Renovations and improvements expense	823,234	2,397,216
Jowein building in Brooklyn, NY [Member]
Operating Loss Carryforwards [Line Items]
Renovations and improvements expense	358,042
Jamaica building [Member]
Operating Loss Carryforwards [Line Items]
Renovations and improvements expense		291,545
Jamaica, NY building [Member]
Operating Loss Carryforwards [Line Items]
Renovations and improvements expense	$ 290,976
9 Bond building in Brooklyn, NY [Member]
Operating Loss Carryforwards [Line Items]
Renovations and improvements expense		$ 289,699
Domestic Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards				8,409,803
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards				10,463,612
City Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards				$ 8,428,574
Minimum [Member]
Operating Loss Carryforwards [Line Items]
Deferred charges amortization period	4 years
Maximum [Member]
Operating Loss Carryforwards [Line Items]
Deferred charges amortization period	21 years