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STOCKHOLDERS' EQUITY: - Directors' Stock Award Plan (Details) - USD ($)
$ in Millions
9 Months Ended
Apr. 26, 2018
Sep. 30, 2020
Sep. 30, 2019
Share based compensation      
Stock based compensation expense     $ 0.5
Directors' Stock Award Plan      
Share based Compensation Plan      
Common shares received on election as director 1,200 1,600  
Additional shares issued at each annual general meeting   1,600  
Total SCC shares reserved for the plan   600,000  
Period of extension of plan   5 years  
Increased share awards issued to directors   1,600