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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Operating activities:      
Net income (loss) $ 4,649 $ (703) $ (50,674)
Adjustments to reconcile net (loss) income to net cash provided by operating activities:      
Depreciation, depletion and accretion of asset retirement obligation 27,472 26,488 25,308
Impairment loss 0 0 2,170
Amortization of intangible assets 793 792 792
(Gain) loss on disposal of assets 1,802 (294) 555
Bad debt expense 0 1 19,592
Amortization of deferred financing cost 105 105 105
Accretion of debt discount 186 186 183
Deferred income taxes (6,137) (4,196) (10,547)
Stock-based compensation, net 3,507 3,184 3,161
Employee stock purchase plan compensation 24 25 34
Changes in assets and liabilities:      
Accounts receivable 12,672 (18,265) 32,899
Unbilled receivables (2,640) 1,805 (2,011)
Inventory (6,638) (5,161) 1,942
Prepaid expenses and other assets 1,996 6,524 751
Deferred revenue (5,805) (9,311) 5,913
Settlement of asset retirement obligation (197) 0 0
Accounts payable 1,974 5,244 4,508
Accrued expenses and other liabilities (2,772) (1,004) (2,243)
Net cash provided by operating activities 30,991 5,420 32,438
Investing activities:      
Acquisition, net of cash acquired 0 (6,547) 0
Purchases of property, plant and equipment (23,031) (12,731) (11,220)
Proceeds from disposal of assets 129 1,070 78
Net cash used in investing activities (22,902) (18,208) (11,142)
Financing activities:      
Repayments of notes payable (10,435) (7,325) (6,771)
Payments under financing lease obligation (394) (116) (123)
Proceeds from revolving credit facility 23,000 10,000 0
Repayment of revolving credit facility (15,000) (10,000) 0
Payment of contingent consideration 0 0 (180)
Proceeds from equity issuance 56 52 42
Royalty stock issuance 0 639 0
Purchase of treasury stock (4,754) (540) (401)
Net cash used in financing activities (7,527) (7,290) (7,433)
Net increase in cash and cash equivalents 562 (20,078) 13,863
Cash and cash equivalents at beginning of year 5,510 25,588 11,725
Cash and cash equivalents at end of year $ 6,072 $ 5,510 $ 25,588