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RESTRICTED CASH AND INVESTMENTS (Tables)
12 Months Ended
Dec. 31, 2018
Restricted Cash And Investments Tables Abstract  
Restricted cash and investments
    At December 31   At December 31   At January 1
(in thousands)   2018   2017   2017
             
Cash and cash equivalents $ 85 $ 3,049 $ 372
Investments   12,170   9,135   2,735
  $ 12,255 $ 12,184 $ 3,107
             
Restricted cash and investments-by item:            
Elliot Lake reclamation trust fund $ 3,120 $ 3,049 $ 2,972
Letters of credit facility pledged assets   9,000   9,000   -
Letters of credit additional collateral   135   135   135
  $ 12,255 $ 12,184 $ 3,107