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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Cash flows used in operating activities:    
Net loss $ (2,087) $ (1,343)
Adjustments to reconcile net loss to net cash used in operating activities (see Schedule A) (336) (289)
Net cash used in operating activities - continuing operations (2,423) (1,632)
Net cash used in operating activities - discontinued operations (44)
Net cash used in operating activities (2,423) (1,676)
Cash flows provided by investing activities:    
Proceeds from the sale of interests in DSIT, net of transaction costs and cash divested 5,261
Release of escrow deposits 579
Net cash provided by investing activities - continuing operations 5,261 579
Net cash provided by investing activities - discontinued operations 100
Net cash provided by investing activities 5,261 679
Cash flows provided by (used in) financing activities:    
Short-term bank credit, net (313) (63)
Proceeds from director loans 1,300
Repayment of loans from former director (1,400)
Repayment of loans from DSIT (340)
Net cash provided by (used in) financing activities - continuing operations (2,053) 1,237
Net cash used in financing activities - discontinued operations
Net cash provided by (used in) financing activities (2,053) 1,237
Effect of exchange rate changes on cash and cash equivalents - continuing operations (3)
Effect of exchange rate changes on cash and cash equivalents - discontinued operations
Net increase in cash and cash equivalents 782 240
Cash and cash equivalents at beginning of year - discontinued operations 19
Cash, cash equivalents and restricted cash at beginning of year - continuing operations 481 222
Cash and cash equivalents at end of year - discontinued operations
Cash, cash equivalents and restricted cash at end of year - continuing operations 1,263 481
Cash, cash equivalents and restricted cash consist of the following: End of period    
Cash and cash equivalents 973 481
Restricted cash 290
Cash, cash equivalents and restricted cash, End of period 1,263 481
Cash, cash equivalents and restricted cash consist of the following: Beginning of period    
Cash and cash equivalents 481 241
Restricted cash
Cash, cash equivalents and restricted cash, Beginning of period 481 241
Cash paid during the year for:    
Interest 84 72
Income taxes 388 42
A. Adjustments to reconcile net loss to net cash used in operating activities:    
Loss from discontinued operations (698)
Depreciation and amortization 66 75
Gain on sale of interests in DSIT, net of income taxes and transaction costs 607
Share of income in DSIT (33) (450)
Impairment of investment in DSIT 33 308
Stock-based compensation 26 22
Director fees paid in common stock 14 32
Changes in operating assets and liabilities:    
Decrease (increase) in accounts receivable 438 (98)
Increase in inventory (32) (27)
Increase in other current assets and other assets (35) (229)
Increase in deferred revenue 497 786
Decrease in balances due to Acorn directors and DSIT (1,517)
Increase (decrease) in accounts payable, accrued expenses other current and non-current liabilities and balances due to Acorn directors and DSIT (400) (10)
Adjustments to reconcile net loss to net cash used in operating activities (336) (289)
B. Non-cash investing and financing activities:    
Accrued preferred dividends to outside investor in OmniMetrix subsequently converted to long-term loan $ 87 $ 100