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STOCKHOLDERS' EQUITY: - Compensation Plan (Details)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Jan. 31, 2015
$ / shares
Jan. 31, 2015
MXN / shares
Mar. 31, 2017
USD ($)
$ / shares
shares
Mar. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2010
$ / shares
Dec. 31, 2010
MXN / shares
Employee Stock Purchase 2010 Plan            
Information related to compensation cost            
Purchase price for initial subscription (in dollars per share) | (per share)         $ 1.28 MXN 26.51
Percentage of title acquired by employee in every two years on shares paid in previous two years     50.00%      
Period of plan     8 years      
Ratio of bonus shares granted to participant     0.1      
Stock based compensation expense | $     $ 0.1 $ 0.1    
Unrecognized compensation expense | $     $ 0.7 $ 1.3    
Period over which unrecognized compensation expense expected to be recognized     1 year 9 months      
Stock award activity, Shares            
Outstanding shares at the beginning of the period | shares     1,401,096 2,227,582    
Exercised (in shares) | shares       (338,989)    
Outstanding shares at the end of the period | shares     1,401,096 1,888,593    
Unit Weighted Average Grant Date Fair Value            
Outstanding shares at the beginning of the period (in dollars per share) | $ / shares     $ 2.05 $ 2.05    
Exercised (in dollars per share) | $ / shares     2.05      
Outstanding shares at the end of the period (in dollars per share) | $ / shares     $ 2.05 $ 2.05    
Employee Stock Purchase 2015 Plan            
Information related to compensation cost            
Purchase price for initial subscription (in dollars per share) | (per share) $ 1.86 MXN 38.44        
Percentage of title acquired by employee in every two years on shares paid in previous two years     50.00%      
Period of plan     8 years      
Ratio of bonus shares granted to participant     0.1      
Stock based compensation expense | $     $ 0.2 $ 0.2    
Unrecognized compensation expense | $     $ 3.4 $ 4.2    
Stock award activity, Shares            
Outstanding shares at the beginning of the period | shares     2,540,223      
Granted (in shares) | shares       2,652,386    
Exercised (in shares) | shares     (228,430)      
Outstanding shares at the end of the period | shares     2,311,793 2,652,386    
Unit Weighted Average Grant Date Fair Value            
Outstanding shares at the beginning of the period (in dollars per share) | $ / shares     $ 2.63      
Granted (in dollars per share) | $ / shares       $ 2.63    
Exercised (in dollars per share) | $ / shares     2.63      
Outstanding shares at the end of the period (in dollars per share) | $ / shares     $ 2.63 $ 2.63