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Stock Option Plan (Tables)
12 Months Ended
Mar. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Stock-Based Payment Activity

   Year ended March 31,
   2014  2015  2016
  

 

Number

of stock

options

  Weighted average exercise price 

 

Number

of stock

options

  Weighted average exercise price 

 

Number

of stock

options

  Weighted average exercise price
 Outstanding at beginning of the year   1,080,500   $7.29    132,000   $2.14   $532,000   $2.1 
Granted during the year   —      —      400,000    2.09    —      —   
Exercised during the year   (230,000)   2.14    —      —      —      —   
Cancelled or expired   (718,500)   9.88    —      —      —      —   
Outstanding and exercisable at the end of the year   132,000   $2.14    532,000   $2.10   $532,000   $2.1 
Range of exercise price per share   $2.09 to $2.14         $2.09 to $2.14          $2.09 to $2.14