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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net income $ 5,612 $ 4,203 $ 5,018
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 104 161 173
Deferred income taxes, net 63 146 (46)
Accrued severance pay (145) (123) 105
Foreign currency exchange rate loss from marketable securities - available-for-sale 0 128 0
Unrealized loss from marketable securities, net 30 23 98
Employees share-based compensation 182 136 138
Gain on disposal of subsidiary (893) 0 0
Realized loss (gain) on sale of marketable securities - available-for-sale, net 25 (44) 0
Decrease (increase) in accounts receivable:      
Trade (141) 1,145 352
Other (680) 37 21
Decrease (increase) in prepaid expenses and deferred cost of revenues (28) (9) 95
Decrease in inventories 1 4 1
Increase (decrease) in accounts payable and accruals:      
Trade 62 (186) 99
Other (396) (1,031) (42)
Increase (decrease) in deferred revenues (1,050) 654 285
Net cash provided by operating activities 2,746 5,244 6,297
CASH FLOWS FROM INVESTING ACTIVITIES:      
Investment in marketable securities - available-for-sale 0 (1,000) 0
Proceeds from sales of marketable securities - available-for-sale 326 1,730 0
Purchase of property and equipment (71) (68) (146)
Severance pay funds 93 82 (32)
Proceeds from (investment in) short-term bank deposits (1,170) (3,535) 3,053
Proceeds from (investment in) marketable securities (1,124) 344 (210)
Proceeds from sale of subsidiary 1,169 0 0
Net cash provided by (used in) investing activities (777) (2,447) 2,665
CASH FLOWS FROM FINANCING ACTIVITIES:      
Employee stock options exercised and paid 53 85 171
Dividend paid (6,173) (5,192) (5,758)
Net cash used in financing activities (6,120) (5,107) (5,587)
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS (4,151) (2,310) 3,375
BALANCE OF CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR 9,165 11,475 8,100
BALANCE OF CASH AND CASH EQUIVALENTS AT END OF YEAR 5,014 9,165 11,475
SUPPLEMENTAL DISCLOSURE OF CASH FLOW AND NON-CASH ACTIVITIES-      
Taxes paid $ 935 $ 841 $ 414