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Consolidated Statements of Comprehensive Income (Losses) (unaudited) (Parenthetical) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Consolidated Statements of Comprehensive Income (Losses)        
Realized gains on sales $ 131,000 $ 0 $ 131,000 $ 59,000