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CASH DIVIDENDS (Details) - $ / shares
1 Months Ended 12 Months Ended
Dec. 31, 2020
Oct. 31, 2020
Jul. 31, 2020
Apr. 30, 2020
Jan. 31, 2021
Jan. 31, 2020
Jan. 31, 2019
CASH DIVIDENDS              
Regular cash dividend declared per common stock         $ 3.00 $ 1.00 $ 1.00
Special cash dividend paid per common stock $ 1.00   $ 1.00        
Regular cash dividend paid per common stock $ 0.25 $ 0.25 $ 0.25 $ 0.25   $ 0.25 $ 0.25