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Schedule II - Valuation and Qualifying Accounts | 12 Months Ended
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Sep. 30, 2023
Notes to Financial Statements |
SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] | Schedule II Geospace Technologies Corporation and Subsidiaries Valuation and Qualifying Accounts (In thousands)
|  | Balance at Beginning of Period |  |  | Charged to Costs and Expenses, net of Recoveries |  |  | Charged to Other Assets |  |  | (Deductions) and Additions |  |  | Balance at End of Period |
Year ended September 30, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts on trade accounts and notes receivable |  | $ | 591 |  |  | $ | (138 | ) |  | $ | — |  |  | $ | (328 | ) |  | $ | 125 |
Year ended September 30, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts on trade accounts and notes receivable |  | $ | 428 |  |  | $ | 292 |  |  | $ | — |  |  | $ | (129 | ) |  | $ | 591 |
|  | Balance at Beginning of Period |  |  | Charged to Costs and Expenses |  |  | Charged to Other Assets |  |  | (Deductions) and Additions |  |  | Balance at End of Period |
Year ended September 30, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Inventory obsolescence reserve |  | $ | 13,971 |  |  | $ | 2,229 |  |  | $ | — |  |  | $ | (2,139 | ) |  | $ | 14,061 |
Year ended September 30, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Inventory obsolescence reserve |  | $ | 13,636 |  |  | $ | 3,222 |  |  | $ | — |  |  | $ | (2,887 | ) |  | $ | 13,971 |

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- Definition The entire disclosure for valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 09 -Publisher SEC Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480678/235-10-S99-4 + Details
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