SUBSEQUENT EVENTS (Tables)
9 Months Ended
Sep. 30, 2016
Schedule of Earnings Per Share [Table Text Block]
    (Unaudited)  
       
Basic net income (loss) per share attributable to U.S. Geothermal Inc.:      
           Three Months Ended September 30, 2016 $ (0.01 )
           Three Months Ended September 30, 2015   0.02  
           Nine Months Ended September 30, 2016   (0.03 )
           Nine Months Ended September 30, 2015   0.04  
       
Basic weighted average shares used in the calculation of net income (loss) per share:      
           Three Months Ended September 30, 2016   18,882,166  
           Three Months Ended September 30, 2015   17,860,722  
           Nine Months Ended September 30, 2016   18,577,269  
           Nine Months Ended September 30, 2015   17,817,111