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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Cash flows provided by operating activities:    
Net income (loss) $ 51 $ (347)
Depreciation and amortization 56 22
Non-cash lease expense 71 88
Stock-based compensation 58 27
Change in operating assets and liabilities:    
(Increase) decrease in accounts receivable (184) 230
Increase in inventory (241) (8)
(Increase) decrease in deferred charges (137) 48
(Increase) decrease in other current assets and other assets (48) 66
Increase (decrease) in accounts payable and accrued expenses 212 (3)
Increase in deferred revenue 557 151
Decrease in operating lease liability (71) (48)
(Decrease) increase in other current liabilities and non-current liabilities (1) 74
Net cash provided by operating activities 323 300
Cash flows used in investing activities:    
Investments in technology (214) (90)
Other capital investments (7) (7)
Net cash used in investing activities (221) (97)
Cash flows (used in) provided by financing activities:    
Short-term credit, net (149) 35
Loan proceeds 462
Stock option exercise proceeds 19
Net cash (used in) provided by financing activities (149) 516
Net (decrease) increase in cash (47) 719
Cash at the beginning of the year 2,063 1,247
Cash at the end of the period 2,016 1,966
Cash paid during the year for:    
Interest 5 23
Non-cash investing and financing activities:    
Accrued preferred dividends to former Acorn director and/or former OmniMetrix CEO $ 3 $ 3