Quarterly report pursuant to Section 13 or 15(d)

Pension Plans. (Details)

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Pension Plans. (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Retirement Plan [Member]      
Pension Plans. (Details) [Line Items]      
Accumulated projected benefit obligation     $ 24,600
Fair value of plan assets     17,600
Underfunded amount     7,000
Net periodic expense $ 22,000 $ 48,000  
Interest cost 151,000 173,000  
Service cost 109,000 101,000  
Expected return on plan assets 238,000 226,000  
Post Retirement Plan [Member]      
Pension Plans. (Details) [Line Items]      
Accumulated projected benefit obligation     $ 5,300
Net periodic expense 42,000 59,000  
Interest cost 10,000 38,000  
Service cost 26,000 14,000  
Amortization expense $ 6,000 $ 7,000