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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Operating activities: |  |  |
Net income (loss) | $ 2,992 | $ 4,649 | $ (703)
Adjustments to reconcile net (loss) income to net cash provided by operating activities: |  |  |
Depreciation, depletion and accretion of asset retirement obligation | 28,936 | 27,472 | 26,488
Amortization of intangible assets | 792 | 793 | 792
Net loss (gain) on disposal of assets | 1,062 | 1,802 | (294)
Amortization of deferred financing cost | 145 | 105 | 105
Accretion of debt discount | 92 | 186 | 186
Loss on extinguishment of debt | 1,341 | 0 | 0
Deferred income taxes | (2,784) | (6,137) | (4,196)
Stock-based compensation, net | 3,216 | 3,507 | 3,184
Employee stock purchase plan compensation | 23 | 24 | 25
Changes in assets and liabilities: |  |  |
Accounts receivable | (17,750) | 12,672 | (18,264)
Unbilled receivables | (2,750) | (2,640) | 1,805
Inventory | 1,779 | (6,638) | (5,161)
Prepaid expenses and other assets | 212 | 1,996 | 6,524
Deferred revenue | (1,101) | (5,805) | (9,311)
Settlement of asset retirement obligation | 0 | (197) | 0
Accounts payable | 53 | 1,974 | 5,244
Accrued expenses and other liabilities | 1,606 | (2,772) | (1,004)
Net cash provided by operating activities | 17,864 | 30,991 | 5,420
Investing activities: |  |  |
Acquisition, net of cash acquired | 0 | 0 | (6,547)
Purchases of property, plant and equipment | (7,010) | (23,031) | (12,731)
Proceeds from disposal of assets | 89 | 129 | 1,070
Net cash used in investing activities | (6,921) | (22,902) | (18,208)
Financing activities: |  |  |
Dividend payments to stockholders | (3,902) | 0 | 0
Proceeds from the issuance of notes payable | 9,755 | 0 | 0
Repayments of notes payable | (10,263) | (10,435) | (7,325)
Proceeds from revolving credit facility | 30,975 | 23,000 | 10,000
Repayment of revolving credit facility | (38,975) | (15,000) | (10,000)
Payments under finance leases | (221) | (394) | (116)
Payment of deferred financing and debt issuance costs | (1,232) | 0 | 0
Payment for debt extinguishment costs | (1,227) | 0 | 0
Employee stock purchase plan issuance | 51 | 56 | 52
Royalty stock issuance | 0 | 0 | 639
Purchase of treasury stock | (422) | (4,754) | (540)
Net cash used in financing activities | (15,461) | (7,527) | (7,290)
Net increase in cash and cash equivalents | (4,518) | 562 | (20,078)
Cash and cash equivalents at beginning of year | 6,072 | 5,510 | 25,588
Cash and cash equivalents at end of year | $ 1,554 | $ 6,072 | $ 5,510

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