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Note 6 - Inventories (Details Textual) - USD ($) $ in Thousands | Mar. 31, 2023 | Sep. 30, 2022
--- | --- | ---
Inventory, Raw Materials, Gross | $ 29,046 | $ 25,609
Semi-finished Goods and Component Parts [Member] |  |
Inventory, Raw Materials, Gross | $ 11,500 | $ 9,400

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- Definition Amount before valuation and LIFO reserves of raw materials expected to be sold, or consumed within one year or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(a)(4)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_InventoryRawMaterials
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_PublicUtilitiesInventoryAxis=geos_SemifinishedGoodsAndComponentPartsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |