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Note 3 - Accounts Receivable (Details Textual) $ in Thousands	3 Months Ended		100 Months Ended
	Apr. 30, 2024 USD ($)	Apr. 30, 2023 USD ($)	Apr. 30, 2024 USD ($)	Dec. 31, 2015 USD ($)
Increase (Decrease) in Accounts Receivable	$ (1,854)	$ (1,862)
Revenue Benchmark [Member] | Customer Concentration Risk [Member]
Number of Major Customers	0	0
Accounts Receivable [Member] | Customer Concentration Risk [Member]
Number of Major Customers	1	1
Accounts Receivable [Member] | Customer Concentration Risk [Member] | One Customer [Member]
Concentration Risk, Percentage	11.00%	12.00%
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Accounts Receivable, after Allowance for Credit Loss	$ 1,800		$ 1,800	$ 41,900
Increase (Decrease) in Accounts Receivable	(300)	$ (600)	(40,100)
Accounts Receivable, Allowance for Credit Loss	0		0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Other Noncurrent Assets [Member]
Accounts Receivable, after Allowance for Credit Loss	$ 1,000		$ 1,000

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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X

- Definition

Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business.

+ References

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X

- Definition

Amount of allowance for credit loss on accounts receivable.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Section S99
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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
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- Definition

The increase (decrease) during the reporting period in amount due within one year (or one business cycle) from customers for the credit sale of goods and services.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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