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MARKETABLE SECURITIES (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]      
Marketable securities, beginning balance $ 2,639 $ 3,642 $ 3,642
Marketable securities acquired 357 0 0
Proceeds from sale of marketable securities (14,074) $ 0 0
Unrealized gain (loss) on marketable securities held at period end 34   (2,491)
Gain on sale of marketable securities 7,881   0
Repurchase of marketable securities pledged to creditors 5,836   7,323
Marketable securities pledged to creditors 0   (5,835)
Marketable securities, ending balance $ 2,673   $ 2,639