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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Cash flows provided by operating activities:    
Net income (loss) $ 26 $ (316)
Depreciation and amortization 37 21
Non-cash lease expense 59 59
Stock-based compensation 36 19
Change in operating assets and liabilities:    
Decrease (increase) in accounts receivable (98) 256
Increase in inventory (127) (10)
Increase in deferred charges (33) (5)
Decrease (increase) in other current assets and other assets (18) 63
Increase (decrease) in accounts payable and accrued expenses 95 (4)
Increase (decrease) in deferred revenue 165 (10)
Decrease in operating lease liability (60) (38)
Increase in other current liabilities and non-current liabilities 1 43
Net cash provided by operating activities 83 78
Cash flows used in investing activities:    
Investments in technology (42) (88)
Payments made for patent filings (3)
Net cash used in investing activities (42) (91)
Cash flows provided by financing activities:    
Short-term credit, net (149) 45
Loan proceeds 462
Stock option exercise proceeds 19
Net cash (used in) provided by financing activities (149) 526
Net (decrease) increase in cash (108) 513
Cash at the beginning of the year 2,063 1,247
Cash at the end of the period 1,955 1,760
Cash paid during the year for:    
Interest 4 16
Non-cash investing and financing activities:    
Accrued preferred dividends to former Acorn director and/or former OmniMetrix CEO $ 2 $ 2