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Note 3 - Accounts Receivable (Details Textual) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Nov. 30, 2018 USD ($)	Oct. 31, 2018 USD ($)	Oct. 31, 2017	Oct. 31, 2018 USD ($)	Oct. 31, 2017	Jan. 31, 2018 USD ($)
Accounts Receivable, Outstanding for Several Years		$ 4,900		$ 4,900		$ 5,400
Contract Receivable Retainage, Total		3,700		3,700
Proceeds from Collection of Accounts Receivable Outstanding for Several Years				500
Allowance for Doubtful Accounts Receivable Outstanding for Several Years		$ 0		$ 0
Sales Revenue, Net [Member] | Customer Concentration Risk [Member]
Number of Major Customers		0	0	0	0
Accounts Receivable [Member] | Customer Concentration Risk [Member]
Number of Major Customers				1		3
Accounts Receivable [Member] | Customer Concentration Risk [Member] | One Customer [Member]
Concentration Risk, Percentage				18.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Three Customers [Member]
Concentration Risk, Percentage						35.00%
Subsequent Event [Member]
Accounts Receivable, Outstanding for Several Years	$ 4,800
Proceeds from Collection of Accounts Receivable Outstanding for Several Years	$ 100
Other Noncurrent Assets [Member]
Contract Receivable Retainage, Total		$ 3,200		$ 3,200

X

- Definition

Represents the amount of accounts receivable, inclusive of retention receivables, that have been outstanding for several years as of the balance sheet date.

+ References

No definition available.

+ Details

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X

- Definition

Represents the balance of the allowance for doubtful accounts pertaining to accounts receivable outstanding for several years.

+ References

No definition available.

+ Details

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X

- Definition

Represents the number of major customers accounting for 10% or more of the specified concentration risk benchmark, which includes, but not limited to, sales revenue, accounts receivable, etc.

+ References

No definition available.

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- Definition

Represents the proceeds received during the period from the collection of accounts receivable that have been outstanding for several years.

+ References

No definition available.

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X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13531-108611

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-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

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- Definition

Amount billed to customers under long-term contracts or programs that have been withheld because of retainage provisions in a contract.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 910
-SubTopic 310
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=68065756&loc=d3e49370-109356

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.3(c)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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