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Accumulated Other Comprehensive Income (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Post Retirement Benefit Plan Items        
Income tax benefit (expense), Post Retirement Benefit Plan Items $ (17,000) $ (20,000) $ (50,000) $ (60,000)
Accumulated Other Comprehensive Income (Loss)        
Beginning balance, Accumulated Other Comprehensive Income (Loss)     1,370,000  
Ending balance, Accumulated Other Comprehensive Income (Loss) $ 401,000   $ 401,000