Quarterly report pursuant to Section 13 or 15(d)

Pension Plans (Details)

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Pension Plans (Details) - USD ($)
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Retirement Plan [Member]      
Pension Plans (Details) [Line Items]      
Projected benefit obligation, amount     $ 23,800,000
Fair value of plan assets     20,000,000
Underfunded amount     3,800,000
Net periodic expense (income) $ 8,000 $ 22,000  
Interest cost 164,000 151,000  
Service cost 101,000 109,000  
Expected return on plan assets 273,000 238,000  
Postretirement Plan [Member]      
Pension Plans (Details) [Line Items]      
Projected benefit obligation, amount     $ 4,300,000
Net periodic expense (income) 32,000 42,000  
Interest cost 26,000 10,000  
Service cost $ 6,000 26,000  
Amortization expense   $ 6,000