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SIGNIFICANT ACCOUNTING POLICIES (Detail Textuals 2) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 23, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Significant Accounting Policies [Line Items] |  |  |  |
Prepaid expenses related to unamortized product brochure costs |  | $ 342,000 | $ 271,000 |
Net realized (losses) gains on marketable securities |  | 30,000 | (39,000) | $ 45,000
Reclassification of net realized (losses) gains from other comprehensive income |  | 30,000 | (39,000) | 45,000
Gross unrealized gains on marketable securities |  |  | 4,000 |
Gross unrealized losses on marketable securities |  | 70,000 | 53,000 |
Selling, general and administrative expenses |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Advertising expenses |  | $ 2,305,000 | $ 2,545,000 | $ 2,480,000
Dividend declared |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Amount of dividend payable in cash per share |  | $ 0.07 |  |
Subsequent Event | Dividend declared |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Percentage of increased dividends payable | 43.00% |  |  |
Amount of dividend payable in cash per share | $ 0.10 |  |  |
Dividends payable, date declared | Jan. 23, 2018 |  |  |
Dividend payable, date to be payable | Mar. 09, 2018 |  |  |
Dividends payable, date of record | Feb. 09, 2018 |  |  |

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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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