Annual report pursuant to Section 13 and 15(d)

Asset Retirement Obligation (Details)

v3.20.1
Asset Retirement Obligation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Mar. 31, 2017
Asset retirement obligation $ 790 $ 745  
Accretion expense 46 44  
Other assets 3,309 1,800  
Facility Closure Trust Deposit      
Other assets $ 670 $ 670  
Asset Retirement Cost      
Asset retirement obligation     $ 700