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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Operating activities:    
Net income (loss) $ 9,435 $ (3,329)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Depreciation, depletion and accretion of asset retirement obligations 20,359 19,904
Amortization of intangible assets 596 596
Loss (gain) on disposal of fixed assets 1,821 (482)
Provision for bad debt 0 1
Amortization of deferred financing cost 79 79
Accretion of debt discount 140 140
Deferred income taxes (4,096) (2,784)
Stock-based compensation 2,472 2,436
Employee stock purchase plan compensation 20 18
Changes in assets and liabilities:    
Accounts receivable 11,888 (14,238)
Unbilled receivables (244) (593)
Inventory (5,770) (5,594)
Prepaid expenses and other assets 4,856 3,072
Deferred revenue (4,942) (6,365)
Accounts payable (3,871) 2,784
Accrued and other expenses 907 4,187
Net cash provided by (used in) operating activities 33,650 (168)
Investing activities:    
Acquisition of Blair facility 0 (6,547)
Purchases of property, plant and equipment (16,126) (9,535)
Proceeds from disposal of assets 123 995
Net cash used in investing activities (16,003) (15,087)
Financing activities:    
Repayments of notes payable (8,952) (5,474)
Payments under finance leases (323) (88)
Proceeds from revolving credit facility 15,000 6,000
Repayment of revolving credit facility (15,000) 0
Employee stock purchase plan issuance 56 52
Purchase of treasury stock (4,629) (451)
Net cash used in financing activities (13,848) 39
Net decrease in cash and cash equivalents 3,799 (15,216)
Cash and cash equivalents at beginning of year 5,510 25,588
Cash and cash equivalents at end of period 9,309 10,372
Noncash Investing and Financing Items [Abstract]    
Purchases of property, plant and equipment in accounts payable and accrued expenses 2,351 685
Other Significant Noncash Transaction, Value of Consideration Given 4,425 0
Additions to asset retirement obligations $ 0 $ 8,281