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v3.23.3

Note 6 - Trade Accounts and Financing Receivable (Tables) | 12 Months Ended
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Sep. 30, 2023
Notes Tables |
Schedule of Accounts Receivable [Table Text Block] |
|  | AS OF SEPTEMBER 30, |
|  | 2023 |  |  | 2022 |
Trade accounts receivable |  | $ | 20,282 |  |  | $ | 13,252 |
Allowance for doubtful accounts |  |  | (125 | ) |  |  | (591 | )
|  | $ | 20,157 |  |  | $ | 12,661 |
Schedule of Notes Receivables [Table Text Block] |
|  | AS OF SEPTEMBER 30, |
|  | 2023 |  |  | 2022 |
Notes receivable |  | $ | 1,216 |  |  | $ | 8,225 |
Less current portion |  |  | (1,216 | ) |  |  | (8,225 | )
Non-current notes receivable |  | $ | — |  |  | $ | — |

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- Definition Tabular disclosure of accounts receivable. + References No definition available. + Details
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Namespace Prefix: | geos_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

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- Definition Tabular disclosure of notes receivable. + References No definition available. + Details
Name: | geos_ScheduleOfNotesReceivablesTableTextBlock
Namespace Prefix: | geos_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration