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Note 6 - Long-term Debt and Notes Payable - Long-term Debt (Details) (Parentheticals) - USD ($)	12 Months Ended
	Jul. 31, 2023	Jul. 31, 2022	Oct. 31, 2022
Virginia Real Estate Loan [Member]
Debt Instrument, Face Amount	$ 6,500,000		$ 6,500,000
Debt Instrument, Periodic Payment	$ 31,812
Debt Instrument, Interest Rate, Stated Percentage	3.95%		3.95%
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid	$ 3,318,029		$ 3,318,029
Debt Instrument, Maturity Date	May 01, 2024	May 01, 2024
North Carolina Real Estate Loan [Member]
Debt Instrument, Face Amount	$ 2,240,000		$ 2,240,000
Debt Instrument, Periodic Payment	$ 10,963	$ 10,963
Debt Instrument, Interest Rate, Stated Percentage	3.95%		3.95%
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid	$ 711,773		$ 711,773
Debt Instrument, Maturity Date	May 01, 2024	May 01, 2024

X

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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-Section 50
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+ Details

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

X

- Definition

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

+ References

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-SubTopic 20
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Balance Type:	na
Period Type:	instant

X

- Definition

Date when the debt instrument is scheduled to be fully repaid, in YYYY-MM-DD format.

+ References

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Balance Type:	na
Period Type:	duration

X

- Definition

Amount of the required periodic payments including both interest and principal payments.

+ References

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Period Type:	duration

X

- Definition

Amount of payment greater than the preceding installment payments to be paid at final maturity date of debt.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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X

- Details

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Namespace Prefix:
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Period Type:

X

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