Note 6 - Long-term Debt and Note Payable to Bank - Long-term Debt (Details) (Parentheticals) - USD ($)	3 Months Ended	12 Months Ended
Jan. 31, 2017	Oct. 31, 2016
Virginia Real Estate Loan [Member]
Original principal	$ 6,500,000	$ 6,500,000
Monthly installments	$ 35,045	$ 36,426
Debt Instrument, Interest Rate, Stated Percentage	3.75%	4.25%
Final payment	$ 4,855,818	$ 4,858,220
Maturity date	Apr. 30, 2018	Apr. 30, 2018
North Carolina Real Estate Loan [Member]
Original principal	$ 2,240,000	$ 2,240,000
Monthly installments	$ 12,077	$ 12,553
Debt Instrument, Interest Rate, Stated Percentage	3.75%	4.25%
Final payment	$ 1,673,389	$ 1,674,217
Maturity date	Apr. 30, 2018	Apr. 30, 2018

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

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- Definition

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

+ References

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
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Period Type:	duration

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

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Balance Type:	debit
Period Type:	duration

- Definition

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

+ References

No definition available.

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- Details

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