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Note 6 - Fair Value of Financial Instruments - Contingent Consideration (Details) - Geovox [Member] $ in Thousands	12 Months Ended
	Sep. 30, 2025 USD ($)
Balance	$ 0
Contingent consideration pursuant to acquisition	2,540
Fair value adjustments	0
Payment of contingent consideration	0
Balance	$ 2,540

X

- Definition

The amount of contingent consideration, classified as a liability, acquired during the period in the business combination.

+ References

No definition available.

+ Details

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Namespace Prefix:	geos_
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Balance Type:	debit
Period Type:	duration

X

- Definition

Fair value adjustments of amount of consideration transferred in business combination. Includes, but is not limited to, cash, liability incurred by acquirer, and equity interest issued by acquirer.

+ References

No definition available.

+ Details

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X

- Definition

The amount of contingent consideration paid in the business combination.

+ References

No definition available.

+ Details

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Namespace Prefix:	geos_
Data Type:	xbrli:monetaryItemType
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X

- Definition

Amount of liability recognized arising from contingent consideration in a business combination.

+ References

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X

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