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SIGNIFICANT ACCOUNTING POLICIES - Dividends, Advertising and Marketable securities (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Jan. 28, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Accounting policies: |  |  |  |
Prepaid expenses related to unamortized product brochure costs |  | $ 269,000 | $ 243,000 |
Net realized (losses) gains on marketable securities |  | 4,000 | (81,000) | $ 30,000
Reclassification of net realized (losses) gains from other comprehensive income |  | 4,000 | (81,000) | 30,000
Gross unrealized gains on marketable securities |  | 0 | 3,000 |
Gross unrealized losses on marketable securities |  | 0 | 12,000 |
Unrealized loss on marketable securities totaled |  |  | 9,000 |
Selling, general and administrative expenses |  |  |  |
Accounting policies: |  |  |  |
Advertising expenses |  | $ 2,543,000 | $ 2,468,000 | $ 2,305,000
Dividend declared |  |  |  |
Accounting policies: |  |  |  |
Amount of dividend payable in cash per share | $ 0.12 |  |  |
Dividends payable, date declared | Jan. 28, 2020 |  |  |
Dividend payable, date to be payable | Mar. 10, 2020 |  |  |
Dividends payable, date of record | Feb. 10, 2020 |  |  |

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