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MARKETABLE SECURITIES: (Schedule of Changes in Fair Value of Company's Marketable Securities) (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]      
Balance at beginning of the period $ 1,709 $ 21,652 $ 21,652
Additions 10,006 4,065 6,716
Sale or maturity (1,734) (18,946) (26,784)
Change in fair value during the period (135) $ 59 125
Balance at end of the period $ 9,846   $ 1,709