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SIGNIFICANT ACCOUNTING POLICIES (Detail Textuals 2) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 22, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Significant Accounting Policies [Line Items] |  |  |  |
Prepaid expenses related to unamortized product brochure costs |  | $ 243,000 | $ 342,000 |
Net realized (losses) gains on marketable securities |  | (81,000) | 30,000 | $ (39,000)
Reclassification of net realized (losses) gains from other comprehensive income |  | (81,000) | 30,000 | (39,000)
Gross unrealized gains on marketable securities |  | 3,000 | 0 |
Gross unrealized losses on marketable securities |  | 12,000 | 70,000 |
Unrealized loss on marketable securities totaled |  | 9,000 | 70,000 |
Selling, general and administrative expenses |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Advertising expenses |  | $ 2,468,000 | $ 2,305,000 | $ 2,545,000
Dividend declared |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Amount of dividend payable in cash per share |  | $ 0.10 |  |
Subsequent Event | Dividend declared |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Percentage of increased dividends payable | 20.00% |  |  |
Amount of dividend payable in cash per share | $ 0.12 |  |  |
Dividends payable, date declared | Jan. 22, 2019 |  |  |
Dividend payable, date to be payable | Mar. 11, 2019 |  |  |
Dividends payable, date of record | Feb. 11, 2019 |  |  |

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