Document and Entity Information
 6 Months Ended
Sep. 30, 2012
Nov. 12, 2012
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Sep. 30, 2012  
Trading Symbol htm  
Entity Registrant Name US GEOTHERMAL INC  
Entity Central Index Key 0001172136  
Current Fiscal Year End Date --03-31  
Entity Filer Category Smaller Reporting Company  
Entity Common Stock, Shares Outstanding   89,705,948
Entity Current Reporting Status Yes  
Entity Voluntary Filers No  
Entity Well Known Seasoned Issuer No  
Document Fiscal Year Focus 2013  
Document Fiscal Period Focus Q2