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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Cash flows from operating activities:    
Net income $ 208 $ 3,404
Adjustments to reconcile net income to operating cash flow:    
Depreciation and amortization 2,238 2,132
Non-cash interest expense 5 9
Non-cash rent expense 0 1
Bad debt expense 0 6
Deferred revenue (23) (23)
Stock-based compensation 755 608
Loss on sale of property and equipment 0 88
(Increase) decrease in operating assets:    
Accounts receivable (1,576) (1,832)
Inventories (907) (642)
Refundable income taxes (309) (384)
Prepaid expenses and other current assets (115) (152)
Increase (decrease) in operating liabilities:    
Accounts payable 3,085 1,695
Accrued expenses 1,003 1,498
Accrued income taxes (725) (553)
Net cash provided by operating activities 3,639 5,855
Cash flows from investing activities:    
Purchases of property and equipment (2,609) (1,685)
Acquisition, net of cash acquired (580) (5,220)
Net cash used in investing activities (3,189) (6,905)
Cash flows from financing activities:    
Purchase of treasury stock 0 (1,583)
Payment of deferred financing cost 0 (25)
Proceeds from note payable 0 5,000
Repayment of note payable (750) (250)
Net cash used in financing activities (750) 3,142
Net (decrease) increase in cash and cash equivalents (300) 2,092
Cash and cash equivalents at the beginning of the period 9,233 7,926
Cash and cash equivalents at the end of the period 8,933 10,018
Supplemental cash flow information:    
Cash paid for income taxes, net 640 2,788
Cash paid for interest 158 60
Non-cash investing activities    
Increase (decrease) in right-of-use assets and operating lease obligations $ 19 $ 45