Note 11 - Goodwill and Other Intangible Assets (Details Textual) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Apr. 30, 2020	Jan. 31, 2022	Jan. 31, 2021
Goodwill, Impairment Loss, Percentage Of Gross Carrying Amount			100.00%
Amortization of Intangible Assets, Total		$ 1,300	$ 1,800
Klein Associates Incorporation [Member]
Impairment of Intangible Assets (Excluding Goodwill), Total		$ 0	$ 0
Seamap [Member]
Goodwill, Impairment Loss	$ 2,500

The percentage of gross carrying amount of goodwill that is impaired.

No definition available.

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- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

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- Definition

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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- Definition

The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value.

+ References

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