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Other non-current liabilities (Details) - USD ($)
Mar. 31, 2015
Mar. 31, 2014
Other Noncurrent Liabilities [Line Items]    
Unearned revenues $ 329,581 $ 320,977
Retirement benefits 531,089 466,280
Other liabilities 143,647 151,742
Total $ 1,004,317 $ 938,999