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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Cash flows used in operating activities:    
Net loss $ (1,820) $ (796)
Income from discontinued operations (65)
Depreciation and amortization 33 40
Loss on sale of investment in DSIT, net of income taxes and transaction costs 829
Impairment of investment in DSIT 33
Share of income in DSIT (33) (69)
Stock-based compensation 18 18
Director fees paid in common stock 9 16
Change in operating assets and liabilities:    
Decrease in accounts receivable 349 411
Increase in inventory (28) (2)
Decrease in deferred charges 64
Increase in other current assets and other assets (20)
Decrease in accounts payable and accrued expenses (33) (441)
Increase in deferred revenue 163 124
Decrease in amounts due to DSIT and directors (1,381)
Decrease in other current liabilities and non-current liabilities (91)
Net cash used in operating activities - continuing operations (1,908) (764)
Net cash used in operating activities - discontinued operations (7)
Net cash used in operating activities (1,908) (771)
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 50
Net cash provided by investing activities 4,971 50
Cash flows provided by (used in) financing activities:    
Short-term credit, net (123) (91)
Proceeds from loans from directors 900
Repayment of director loans (1,300)
Repayments of loans from DSIT (340)
Net cash provided by (used in) financing activities (1,763) 809
Net increase in cash and cash equivalents 1,300 88
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 12
Cash and cash equivalents at the end of the period - continuing operations 1,781 317
Non-cash investing and financing activities:    
Accrual of preferred dividends to outside investor in OmniMetrix and subsequent conversion to loan $ 50 $ 50