XML 50 R33.htm IDEA: XBRL DOCUMENT v3.19.1
Summary of Business and Significant Accounting Policies (Asset Retirement Obligations) (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 31, 2019
Jan. 31, 2018
Accounting Policies [Abstract]    
Asset retirement obligation beginning of period $ 170 $ 590
Decrease in obligation 0 (425)
Accretion expense 9 5
Asset retirement obligation end of period $ 179 $ 170