XML 151 R135.htm IDEA: XBRL DOCUMENT v3.21.2
SEGMENT REPORTING (Narrative) (Details) - segment
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
SEGMENT REPORTING      
Number of operating segments 2 2 2
Concentration Risk Threshold Percentage 10.00% 10.00% 10.00%