Quarterly report pursuant to Section 13 or 15(d)

Asset Retirement Obligation (Details)

v3.20.1
Asset Retirement Obligation (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Mar. 31, 2017
Asset retirement obligation $ 802   $ 790 $ 700
Accretion expense 12 $ 11    
Other Assets        
Contributed to the Trust Fund $ 670,000