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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Cash flows from operating activities:    
Net income $ 6,209 $ 3,986
Adjustments to reconcile net income to operating cash flow:    
Depreciation and amortization 1,632 1,569
Stock-based compensation 1,296 655
Non-cash interest expense 17 3
Bad debt expense 0 2
Gain on sale of equipment 0 (33)
(Increase) decrease in operating assets:    
Accounts receivable (651) 91
Inventories 650 (39)
Refundable income taxes (180) 40
Prepaid expenses and other current assets 531 232
Increase (decrease) in operating liabilities:    
Accounts payable (574) (2,526)
Accrued expenses (366) 451
Accrued income taxes (474) 1,024
Net cash provided by operating activities 8,090 5,455
Cash flows from investing activities:    
Purchases of property and equipment (3,905) (1,990)
Proceeds from sales or equipment 0 40
Net cash used in investing activities (3,905) (1,950)
Cash flows from financing activities:    
Repayment of note payable (2,750) (500)
Net cash used in financing activities (2,750) (500)
Net increase in cash and cash equivalents 1,435 3,005
Cash and cash equivalents at the beginning of the period 13,198 4,444
Cash and cash equivalents at the end of the period 14,633 7,449
Supplemental cash flow information:    
Cash paid for income taxes, net of (refunds) 3,312 973
Cash paid for interest 89 238
Non-cash investing activities    
Accrued purchase of property and equipment $ 106 $ 110