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Stock Option Plan (Tables)
 12 Months Ended
Mar. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Stock-Based Payment Activity

A summary of the option activity (with weighted average prices per option) is as follows:

 

   Year ended March 31,
   2015  2016  2017
   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   132,000   $2.14    532,000   $2.1    532,000   $2.1 
Granted during the year   400,000    2.09    —    —    —    — 
Outstanding and exercisable at the end of the year   532,000   $2.10    532,000   $2.1    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