Note 9 - Long-term Debt - Long-term Debt (Details) - USD ($)	Jan. 31, 2020	Jul. 31, 2019
Long-term Debt, Gross	$ 20,000,000	$ 20,000,000
Unamortized discount and accrued fees	(955,236)	(400,037)
Long-term debt, net of unamortized discount	$ 19,044,764	$ 19,599,963

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant