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Summary of Significant Accounting Policies (Details) - USD ($)
 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Financial Position at:      
Current assets $ 8,151,121 $ 4,202,662  
Non-current assets 121,071 158,938  
Total assets 8,272,192 4,361,600  
Current liabilities 2,834,470 1,087,738  
Non-current liabilities  
Total liabilities 2,834,470 1,087,738  
Net assets 5,437,722 3,273,862  
Results of Operations:      
Revenues 4,271,966 3,590,217 $ 1,662,406,000
Operating expenses 1,995,178 1,404,402 935,788,000
Other income (expenses) net (275,665) (163,151) (139,045,000)
Earnings before tax 2,221,646 2,348,966 865,663,000
Tax expenses (benefits) 633,614 464,327 164,817,000
Net income $ 1,918,839 $ 1,884,639 $ 700,846,000