Note 9 - Long-term Debt (Details Textual)	12 Months Ended
Jul. 31, 2021 USD ($) shares	Jul. 31, 2020 USD ($) shares
Stock Issued During Period, Value, Credit Facility	$ 1,170,000	$ 1,400,000
Amortization of Debt Discount (Premium)	$ 1,375,754	1,669,514
Working Capital Ratio	23
Credit Agreement [Member]
Repayments of Long-term Debt, Total	$ 10,000,000
Long-term Debt, Gross	10,000,000	20,000,000
Amortization of Debt Discount (Premium)	1,375,754	1,669,514
Interest Paid, Including Capitalized Interest, Operating and Investing Activities, Total	$ 1,255,556	1,626,667
Debt Instrument, Interest Rate, Stated Percentage	8.00%
Debt Instrument, Interest Rate, Effective Percentage	18.10%
Debt Instrument, Covenant, Minimum Working Capital Ratio	1
Third Amended and Restated Credit Agreement [Member]
Long-term Debt, Gross	$ 18,000,000	$ 20,000,000
Stock Issued During Period, Shares, Credit Facility (in shares) \| shares	1,249,039	1,743,462
Stock Issued During Period, Value, Credit Facility	$ 1,170,000	$ 1,400,000
Percentage of Outstanding Principal of Anniversary Fee	6.50%	7.00%

The minimum working capital ratio allowed under the covenant of the debt instrument.

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The percent of outstanding principal of debt instrument of anniversary fee.

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Number of shares issued during the period as payment of anniversary fees to lenders.

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Amount of stock issued during the period as payment of anniversary fees to lenders.

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Represents working capital ratio.

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Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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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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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount of cash paid for interest, including, but not limited to, capitalized interest and payment to settle zero-coupon bond attributable to accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount; classified as operating and investing activities.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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