XML 56 R40.htm IDEA: XBRL DOCUMENT v3.22.1
Employee Benefit Plans - Schedule of postretirement health care benefits costs and obligation (Details) - Other Postretirement Benefit Plans, Defined Benefit - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]    
Benefit obligation $ 1,078,000 $ 465,000
Aggregate of service and interest cost 29,000 28,000
Benefit obligation (853,000) (356,000)
Aggregate of service and interest cost $ (21,000) $ (20,000)