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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Cash flows from operating activities:    
Net (loss) income $ (895) $ 1,306
Adjustments to reconcile net (loss) income to operating cash flow:    
Depreciation and amortization 791 815
Non-cash interest expense 2 6
Deferred revenue (8) (8)
Stock-based compensation 315 153
Loss on sale of property and equipment 0 7
(Increase) decrease in operating assets:    
Accounts receivable (1,458) (1,959)
Inventories (364) 193
Refundable income taxes (159) (15)
Prepaid expenses and other current assets 188 54
Increase (decrease) in operating liabilities:    
Accounts payable 2,109 (301)
Accrued expenses (643) 398
Accrued income taxes (526) 561
Net cash (used in) provided by operating activities (648) 1,210
Cash flows from investing activities:    
Purchases of property and equipment (348) (518)
Net cash used in investing activities (348) (518)
Cash flows from financing activities:    
Repayment of note payable (250) 0
Net cash used in financing activities (250) 0
Net (decrease) increase in cash and cash equivalents (1,246) 692
Cash and cash equivalents at the beginning of the period 9,233 7,926
Cash and cash equivalents at the end of the period 7,987 8,618
Supplemental cash flow information:    
Cash paid for income taxes, net 95 47
Cash paid for interest 40 16
Non-cash investing activities    
Increase (decrease) in right-of-use assets and operating lease obligations $ 36 $ 21