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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Cash flows from operating activities:    
Net income (loss) $ 3,986 $ (775)
Adjustments to reconcile net income (loss) to operating cash flow:    
Depreciation and amortization 1,569 1,513
Stock-based compensation 655 547
Non-cash interest expense 3 3
Bad debt expense 2 0
Deferred revenue 0 (15)
Gain on sale of equipment (33) 0
(Increase) decrease in operating assets:    
Accounts receivable 91 (424)
Inventories (39) (151)
Refundable income taxes 40 (440)
Prepaid expenses and other current assets 232 154
Increase (decrease) in operating liabilities:    
Accounts payable (2,526) 246
Accrued expenses 451 (462)
Accrued income taxes 1,024 (725)
Net cash provided by (used in) operating activities 5,455 (529)
Cash flows from investing activities:    
Purchases of property and equipment (1,990) (1,710)
Proceeds from sales of equipment 40 0
Net cash used in investing activities (1,950) (1,710)
Cash flows from financing activities:    
Repayment of note payable (500) (500)
Net cash used in financing activities (500) (500)
Net increase (decrease) in cash and cash equivalents 3,005 (2,739)
Cash and cash equivalents at the beginning of the period 4,444 9,233
Cash and cash equivalents at the end of the period 7,449 6,494
Supplemental cash flow information:    
Cash paid for income taxes, net 973 640
Cash paid for interest 238 88
Non-cash investing activities    
Accrued purchase of property and equipment 110 398
Increase in right-of-use assets and operating lease obligations $ 0 $ 36