XML 42 R31.htm IDEA: XBRL DOCUMENT v3.21.2

Note 3 - Accounts Receivable (Details Textual) $ in Thousands	3 Months Ended			9 Months Ended		12 Months Ended
	Oct. 31, 2021 USD ($)	Apr. 30, 2021 USD ($)	Oct. 31, 2020	Oct. 31, 2021 USD ($)	Oct. 31, 2020	Jan. 31, 2021 USD ($)
Accounts Receivable, Outstanding for Several Years	$ 3,600			$ 3,600		$ 3,600
Retention Receivable	3,400			3,400		$ 3,400
Proceeds from Collection of Accounts Receivable Outstanding for Several Years		$ 100
Allowance for Doubtful Accounts Receivable Outstanding for Several Years	$ 0			$ 0
Revenue Benchmark [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		0
Accounts Receivable [Member] | Customer Concentration Risk [Member] | One Customer [Member]
Concentration Risk, Percentage				11.00%
Other Noncurrent Assets [Member]
Retention Receivable	$ 2,400			$ 2,400		$ 2,400

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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Balance Type:	debit
Period Type:	instant

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.

+ Details

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Balance Type:	na
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X

- 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.

+ Details

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X

- Definition

Represents the amount of retention receivable.

+ References

No definition available.

+ Details

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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://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 42
-URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9054-108599

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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- Details

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- Details

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