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SIGNIFICANT ACCOUNTING POLICIES - Dividends, Advertising and Marketable securities (Details) - USD ($)	12 Months Ended
	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