Significant Accounting Policies (Policies)	9 Months Ended
Jun. 30, 2023
Accounting Policies [Abstract]
Basis of Accounting, Policy [Policy Text Block]	Basis of Presentation The consolidated balance sheet of Geospace Technologies Corporation and its subsidiaries (the “Company”) at September 30, 2022 was derived from the Company’s audited consolidated financial statements at that date. The consolidated balance sheet at June 30, 2023 and the consolidated statements of operations, comprehensive income (loss), stockholders’ equity and cash flows for the three and nine months ended June 30, 2023 and 2022 were prepared by the Company without audit. In the opinion of management, all adjustments, consisting of normal recurring adjustments, necessary to present fairly the consolidated financial position, results of operations and cash flows were made. All significant intercompany balances and transactions have been eliminated. The results of operations for the three and nine months ended June 30, 2023 are not necessarily indicative of the operating results for a full year or of future operations. Certain information and footnote disclosures normally included in financial statements presented in accordance with accounting principles generally accepted in the United States of America ("U.S. GAAP") were omitted pursuant to the rules of the Securities and Exchange Commission. The accompanying consolidated financial statements should be read in conjunction with the financial statements and notes thereto contained in the Company’s Annual Report on Form 10-K for the Company’s fiscal year ended September 30, 2022.
Use of Estimates, Policy [Policy Text Block]	Use of Estimates The preparation of financial statements in conformity GAAP requires the use of estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. The Company considers many factors in selecting appropriate operational and financial accounting policies and controls, and in developing the estimates and assumptions that are used in the preparation of these financial statements. The Company continually evaluates its estimates, including those related to revenue recognition, bad debt reserves, collectability of rental revenue, inventory obsolescence reserves, self-insurance reserves, product warranty reserves, useful lives of long-lived assets, impairment of long-lived assets, impairment of goodwill and other intangible assets, contingent consideration and deferred income tax assets. The Company bases its estimates on historical experience and various other factors that are believed to be reasonable under the circumstances. While management believes current estimates are reasonable and appropriate, actual results may differ from these estimates under different conditions or assumptions.
Cash and Cash Equivalents, Policy [Policy Text Block]	Cash and Cash Equivalents The Company considers all highly liquid investments purchased with an original or remaining maturity at the time of purchase of three months or less to be cash equivalents. At June 30, 2023 and September 30, 2022, the Company had restricted cash of $0.3 million and $0.2 million, respectively. The restricted cash at June 30, 2023 consisted of collateral on a standby letter of credit and a deposit with a bank, which serves as collateral on employee issued credit cards. At June 30, 2023, cash and cash equivalents included $3.5 million held by the Company’s foreign subsidiaries and branch offices, including $2.1 million held by its subsidiary in the Russian Federation. In response to sanctions imposed by the U.S. and others on Russia, the Russian government has imposed restrictions on companies' abilities to repatriate or otherwise remit cash from their Russian-based operations to locations outside of Russia. As a result, this cash can be used in our Russian operations, but the Company may be unable to transfer it out of Russia without incurring substantial costs, if at all. In addition, if the Company were to repatriate the cash held by its Russian subsidiary, it would be required to accrue and pay taxes on any amount repatriated. During the second quarter of fiscal year 2023, in light of recent volatility in the financial markets, the Company entered into an IntraFi Cash Service ("ICS") Deposit Placement Agreement with IntraFi Network LLC through its primary bank, Woodforest National Bank. The ICS program offers access to unlimited Federal Deposit Insurance Corporation ("FDIC') insurance on the Company's domestically held cash in excess of $5.0 million, thereby mitigating its risk of falling outside of FDIC coverage limits.
Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block]	Impairment of Long-lived Assets The Company's long-lived assets are reviewed for impairment whenever an event or circumstance indicates that the carrying amount of an asset or group of assets may not be recoverable. The impairment review, if necessary, includes a comparison of the expected future cash flows (undiscounted and without interest charges) to be generated by an asset group with the associated carrying value of the related assets. If the carrying value of the asset group exceeds the expected future cash flows, an impairment loss is recognized to the extent that the carrying value of the asset group exceeds its fair value. During the quarter ended June 30, 2023, no events or changes in circumstances were identified indicating the carrying value of any of the Company's asset groups may not be recoverable.
New Accounting Pronouncements, Policy [Policy Text Block]	Recently Issued Accounting Pronouncements In June 2016, the Financial Accounting Standards Board (the “FASB”) issued guidance surrounding credit losses for financial instruments that replaces the incurred loss impairment methodology in generally accepted accounting principles. The new impairment model requires immediate recognition of estimated credit losses expected to occur for most financial assets and certain other financial instruments. For available-for-sale debt securities with unrealized losses, credit losses will be recognized as allowances rather than reductions in the amortized cost of the securities. As a smaller reporting company, the Company must adopt this standard no later than the first quarter of its fiscal year ending September 30, 2024, although early adoption is permitted. The standard’s provisions will be applied as a cumulative-effect adjustment to retained earnings as of the beginning of the first effective reporting period. The Company intends to adopt this standard during the first quarter of its fiscal year ending September 30, 2024 and does not expect the adoption of this guidance to have any material impact on its consolidated financial statements. All other new accounting pronouncements that have been issued, but not yet effective, are currently being evaluated and at this time are not expected to have a material impact on the Company's financial position or results of operations.

Significant Accounting Policies (Policies)

9 Months Ended

Jun. 30, 2023

Basis of Accounting, Policy [Policy Text Block]

Basis of Presentation

The consolidated balance sheet of Geospace Technologies Corporation and its subsidiaries (the “Company”) at September 30, 2022 was derived from the Company’s audited consolidated financial statements at that date. The consolidated balance sheet at June 30, 2023 and the consolidated statements of operations, comprehensive income (loss), stockholders’ equity and cash flows for the three and nine months ended June 30, 2023 and 2022 were prepared by the Company without audit. In the opinion of management, all adjustments, consisting of normal recurring adjustments, necessary to present fairly the consolidated financial position, results of operations and cash flows were made. All significant intercompany balances and transactions have been eliminated. The results of operations for the three and nine months ended June 30, 2023 are not necessarily indicative of the operating results for a full year or of future operations.

Certain information and footnote disclosures normally included in financial statements presented in accordance with accounting principles generally accepted in the United States of America ("U.S. GAAP") were omitted pursuant to the rules of the Securities and Exchange Commission. The accompanying consolidated financial statements should be read in conjunction with the financial statements and notes thereto contained in the Company’s Annual Report on Form 10-K for the Company’s fiscal year ended September 30, 2022.

Use of Estimates, Policy [Policy Text Block]

Use of Estimates

The preparation of financial statements in conformity GAAP requires the use of estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. The Company considers many factors in selecting appropriate operational and financial accounting policies and controls, and in developing the estimates and assumptions that are used in the preparation of these financial statements. The Company continually evaluates its estimates, including those related to revenue recognition, bad debt reserves, collectability of rental revenue, inventory obsolescence reserves, self-insurance reserves, product warranty reserves, useful lives of long-lived assets, impairment of long-lived assets, impairment of goodwill and other intangible assets, contingent consideration and deferred income tax assets. The Company bases its estimates on historical experience and various other factors that are believed to be reasonable under the circumstances. While management believes current estimates are reasonable and appropriate, actual results may differ from these estimates under different conditions or assumptions.

Cash and Cash Equivalents, Policy [Policy Text Block]

Cash and Cash Equivalents

The Company considers all highly liquid investments purchased with an original or remaining maturity at the time of purchase of three months or less to be cash equivalents. At June 30, 2023 and September 30, 2022, the Company had restricted cash of $0.3 million and $0.2 million, respectively. The restricted cash at June 30, 2023 consisted of collateral on a standby letter of credit and a deposit with a bank, which serves as collateral on employee issued credit cards. At June 30, 2023, cash and cash equivalents included $3.5 million held by the Company’s foreign subsidiaries and branch offices, including $2.1 million held by its subsidiary in the Russian Federation. In response to sanctions imposed by the U.S. and others on Russia, the Russian government has imposed restrictions on companies' abilities to repatriate or otherwise remit cash from their Russian-based operations to locations outside of Russia. As a result, this cash can be used in our Russian operations, but the Company may be unable to transfer it out of Russia without incurring substantial costs, if at all. In addition, if the Company were to repatriate the cash held by its Russian subsidiary, it would be required to accrue and pay taxes on any amount repatriated. During the second quarter of fiscal year 2023, in light of recent volatility in the financial markets, the Company entered into an IntraFi Cash Service ("ICS") Deposit Placement Agreement with IntraFi Network LLC through its primary bank, Woodforest National Bank. The ICS program offers access to unlimited Federal Deposit Insurance Corporation ("FDIC') insurance on the Company's domestically held cash in excess of $5.0 million, thereby mitigating its risk of falling outside of FDIC coverage limits.

Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block]

Impairment of Long-lived Assets

The Company's long-lived assets are reviewed for impairment whenever an event or circumstance indicates that the carrying amount of an asset or group of assets may not be recoverable. The impairment review, if necessary, includes a comparison of the expected future cash flows (undiscounted and without interest charges) to be generated by an asset group with the associated carrying value of the related assets. If the carrying value of the asset group exceeds the expected future cash flows, an impairment loss is recognized to the extent that the carrying value of the asset group exceeds its fair value. During the quarter ended June 30, 2023, no events or changes in circumstances were identified indicating the carrying value of any of the Company's asset groups may not be recoverable.

New Accounting Pronouncements, Policy [Policy Text Block]

Recently Issued Accounting Pronouncements

In June 2016, the Financial Accounting Standards Board (the “FASB”) issued guidance surrounding credit losses for financial instruments that replaces the incurred loss impairment methodology in generally accepted accounting principles. The new impairment model requires immediate recognition of estimated credit losses expected to occur for most financial assets and certain other financial instruments. For available-for-sale debt securities with unrealized losses, credit losses will be recognized as allowances rather than reductions in the amortized cost of the securities. As a smaller reporting company, the Company must adopt this standard no later than the first quarter of its fiscal year ending September 30, 2024, although early adoption is permitted. The standard’s provisions will be applied as a cumulative-effect adjustment to retained earnings as of the beginning of the first effective reporting period. The Company intends to adopt this standard during the first quarter of its fiscal year ending September 30, 2024 and does not expect the adoption of this guidance to have any material impact on its consolidated financial statements.

All other new accounting pronouncements that have been issued, but not yet effective, are currently being evaluated and at this time are not expected to have a material impact on the Company's financial position or results of operations.