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Debt | 12 Months Ended
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Dec. 31, 2023
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Debt | 6. Debt Dominion Loan Agreement On September 30, 2019, the Company entered into a Loan and Security Agreement with Dominion Bank, a Texas state bank (“Dominion Bank”). On September 30, 2023, the Company entered into a Fifth Loan Modification Agreement (the “Fifth Modification Agreement”) to the Loan and Security Agreement (as amended by (i) that certain Loan Modification Agreement dated as of September 30, 2020, (ii) that certain Second Loan Modification Agreement dated as of September 30, 2021, (iii) that certain Third Loan Modification Agreement dated as of September 30, 2022, (iv) that certain Fourth Modification Agreement dated as of March 21, 2023, and (v) the Fifth Modification Agreement, the “Loan Agreement”). The Loan Agreement now provides for a secured revolving credit facility (the “Revolving Credit Facility”) in an amount up to the lesser of (I) an amount equal to the Borrowing Base or (II) $5 million. The Company’s obligations under the Loan Agreement are secured by a Certificate of Deposit with Dominion Bank for $5.0M (the “Deposit”) in the Company’s collateral account. As of December 31, 2023, the Company has not borrowed any amounts under the Revolving Credit Facility and has approximately $5 million available for withdrawal. Under the Revolving Credit Facility, interest will accrue at an annual rate equal to the lesser of (i) 7.75% and (ii) the greater of (a) the prime rate as published from time to time in The Wall Street Journal or (b) 4.75%. From and after September 30, 2023 and so long as the Deposit held by Dominion Bank remains greater than or equal to the indebtedness (the “Financial Covenant Suspension Threshold”), the testing of the financial covenants set forth in the Loan Agreement has been suspended. The financial covenant testing shall resume if and when the Financial Covenant Suspension Threshold is no longer satisfied. The maturity date of the Loan Agreement is September 30, 2024. The Company does not currently have any notes payable under the Revolving Credit Facility. Dominion Letters of Credit As of December 31, 2023, Dominion Bank has issued one letter of credit in the amount of $265,000 to support the Company’s workers compensation insurance. The letter of credit is secured by a certificate of deposit with Dominion Bank. Other Indebtedness As of December 31, 2023, the Company has one note payable to a finance company for various insurance premiums totaling $910,000. In addition, the Company leases certain seismic recording equipment and vehicles under leases classified as finance leases. The Company’s Consolidated Balance Sheets as of December 31, 2023 and 2022 include finance leases of $1.8 million and $277,000, respectively. Maturities of Debt The Company’s aggregate principal amount of outstanding notes payable and the interest rates and monthly payments as of December 31, 2023 and 2022 are as follows (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, 2023 | ​ | December 31, 2022
Notes payable to finance company for insurance | ​ | ​ | ​ | ​ | ​ | ​
Aggregate principal amount outstanding | ​ | $ | 910 | ​ | $ | 205
Interest rate | ​ | ​ | 8.75% | ​ | ​ | 8.24%
​ The Company’s aggregate maturities of finance leases at December 31, 2023 are as follows (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
January 2024 - December 2024 | ​ | $ | 470 | ​ | ​ | ​
January 2025 - December 2025 | ​ | ​ | 569 | ​ | ​ | ​
January 2026 - December 2026 | ​ | ​ | 517 | ​ | ​ | ​
January 2027 - December 2027 | ​ | ​ | 203 | ​ | ​ | ​
Obligations under finance leases | ​ | $ | 1,759 | ​ | ​ | ​
​ Interest rates on these leases ranged from 4.86% to 8.74%.

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- Definition The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(c)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 470 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//470/tableOfContent Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1C -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1C Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1C -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1C Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1C -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1C Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1E -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1E Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1I -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1I Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1I -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1I Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1I -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-1I + Details
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