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Consolidated Statements of Comprehensive Income (Parentheticals) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Statement of Comprehensive Income [Abstract]        
Actuarial gain on retirement plan, tax effect $ (21) $ (8) $ 203 $ (62)