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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Cash flows from operating activities:    
Net income $ 2,426 $ 830
Adjustments to reconcile net income to operating cash flow:    
Depreciation and amortization 796 783
Stock-based compensation 673 343
Non-cash interest expense 2 2
(Increase) decrease in operating assets:    
Accounts receivable (1,189) (572)
Inventories 974 339
Refundable income taxes (378) 44
Prepaid expenses and other current assets 31 377
Increase (decrease) in operating liabilities:    
Accounts payable (6) 1,046
Accrued expenses (1,309) (581)
Accrued income taxes (474) 416
Net cash provided by operating activities 1,546 3,027
Cash flows from investing activities:    
Purchases of property and equipment (2,469) (1,762)
Net cash used in investing activities (2,469) (1,762)
Cash flows from financing activities:    
Repayment of note payable (250) (500)
Net cash used in financing activities (250) (500)
Net (decrease) increase in cash and cash equivalents (1,173) 765
Cash and cash equivalents at the beginning of the period 13,198 4,444
Cash and cash equivalents at the end of the period 12,025 5,209
Supplemental cash flow information:    
Cash paid for income taxes, net of (refunds) 1,934 47
Cash paid for interest 50 130
Non-cash investing activities    
Accrued purchase of property and equipment 192 122
Right-of-use assets obtained in exchange for lease obligations $ 0 $ 19