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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Cash flows used in operating activities:    
Net loss $ (1,825) $ (599)
Loss from discontinued operations (698)
Depreciation and amortization 49 58
Loss on sale of investment in DSIT, net of income taxes and transaction costs 607
Impairment of investment in DSIT 33
Share of income in DSIT (33) (258)
Stock-based compensation 21 22
Director fees paid in common stock 14 24
Change in operating assets and liabilities:    
Decrease in accounts receivable 316 352
Increase in inventory (96) (39)
Decrease in deferred charges 120
Increase in other current assets and other assets (131)
Decrease in accounts payable and accrued expenses (110) (404)
Increase in deferred revenue 323 264
Decrease in amounts due to DSIT and former directors (1,418)
Decrease in other current liabilities and non-current liabilities (133)
Net cash used in operating activities - continuing operations (2,263) (1,278)
Net cash used in operating activities - discontinued operations (44)
Net cash used in operating activities (2,263) (1,322)
Cash flows provided by investing activities:    
Proceeds from the sale of interests in DSIT, net of transaction costs 4,971
Net cash provided by investing activities - continuing operations 4,971
Net cash provided by investing activities - discontinued operations 100
Net cash provided by investing activities 4,971 100
Cash flows provided by (used in) financing activities:    
Short-term credit, net (114) (26)
Proceeds from loans from directors 1,300
Repayment of loans from former directors (1,300)
Repayments of loans from DSIT (340)
Net cash provided by (used in) financing activities (1,754) 1,274
Effect of exchange rate changes on cash and cash equivalents - continuing operations (13)
Net increase in cash and cash equivalents 941 52
Cash and cash equivalents at the beginning of the year - discontinued operations 19
Cash and cash equivalents at the beginning of the year - continuing operations 481 222
Cash and cash equivalents at the end of the period - discontinued operations
Cash and cash equivalents at the end of the period - continuing operations 1,422 293
Non-cash investing and financing activities:    
Accrual of preferred dividends to outside investor in OmniMetrix and subsequent conversion to loan $ 67 $ 75