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SIGNIFICANT ACCOUNTING POLICIES - Dividends, Advertising and Marketable securities (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Accounting policies: |  |  |
Prepaid expenses related to unamortized product brochure costs | $ 132,000 | $ 194,000 |
Selling, general and administrative expenses |  |  |
Accounting policies: |  |  |
Advertising expenses | $ 1,645,000 | $ 2,013,000 | $ 2,543,000
Dividend declared |  |  |
Accounting policies: |  |  |
Amount of dividend payable in cash per share | $ 0.12 |  |
Dividends payable, date declared | Jan. 25, 2022 |  |
Dividend payable, date to be payable | Mar. 10, 2022 |  |
Dividends payable, date of record | Feb. 10, 2022 |  |

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