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8. Other Current Liabilities (Tables)
 3 Months Ended
Jun. 30, 2017
Payables and Accruals [Abstract]  
Other current liabilities
   June 30,   March 31, 
   2016   2017 
Accrued interest  $37,721   $5,391 
Other accrued liabilities   45,124    64,076 
Total other current liabilities  $82,845   $69,467