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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Cash flows from operating activities:    
Net income (loss) $ 830 $ (895)
Adjustments to reconcile net income (loss) to operating cash flow:    
Depreciation and amortization 783 791
Non-cash interest expense 2 2
Deferred revenue 0 (8)
Stock-based compensation 343 315
(Increase) decrease in operating assets:    
Accounts receivable (572) (1,458)
Inventories 339 (364)
Refundable income taxes 44 (159)
Prepaid expenses and other current assets 377 188
Increase (decrease) in operating liabilities:    
Accounts payable 1,046 2,109
Accrued expenses (581) (643)
Accrued income taxes 416 (526)
Net cash provided by (used in) operating activities 3,027 (648)
Cash flows from investing activities:    
Purchases of property and equipment (1,762) (348)
Net cash used in investing activities (1,762) (348)
Cash flows from financing activities:    
Repayment of note payable (500) (250)
Net cash used in financing activities (500) (250)
Net increase (decrease) in cash and cash equivalents 765 (1,246)
Cash and cash equivalents at the beginning of the period 4,444 9,233
Cash and cash equivalents at the end of the period 5,209 7,987
Supplemental cash flow information:    
Cash paid for income taxes, net 47 95
Cash paid for interest 130 40
Non-cash investing activities    
Accrued purchase of property and equipment 122 17
Increase in right-of-use assets and operating lease obligations $ 19 $ 36