Note 15 - Income Taxes (Details Textual) $ in Millions	7 Months Ended	12 Months Ended			13 Months Ended
	Jul. 31, 2018	Jul. 31, 2019 USD ($)	Jul. 31, 2018 USD ($)	Jul. 31, 2017 USD ($)	Jul. 31, 2019 USD ($)	Jul. 31, 2019 CAD ($)
Operating Income (Loss), Total		$ (14,977,013)	$ (16,313,981)	$ (15,218,433)
Interest Expense Carryforward		1,800,000			$ 1,800,000
Current Income Tax Expense (Benefit), Total					$ 0
Deferred Income Tax Expense (Benefit), Total		(14,372)	(707,511)	(34,355)
Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act, Amount			$ (232,843)
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%	26.87%	35.00%
Effective Income Tax Rate Reconciliation, Recognition of Deferred Tax Assets to Offset Deferred Tax Liability, Amount			$ (430,121)
Percentage of Valuation Allowance Recorded from Income Taxes		100.00%
UNITED STATES
Operating Income (Loss), Total		$ (6,300,000)	$ (17,700,000)
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards, Total						$ 166.6
Foreign Tax Authority [Member] | Canada Revenue Agency [Member]
Operating Loss Carryforwards, Total						$ 5.2