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Consolidated Statements of Shareholders' Equity (USD $)
Common stock
Additional paid-in capital
Retained earnings/Accumulated deficit
Due from shareholder
Total
Balance at Jun. 30, 2013          
Increase (Decrease) in Shareholders' Equity          
Cancellation (in shares) (19)us-gaap_TreasuryStockSharesRetired
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Net income for the period     $ 2,833,843us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
  $ 2,833,843us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Balance at Mar. 31, 2014 483,650us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
688,881,939us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
2,833,843us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
  692,199,432us-gaap_StockholdersEquity
Balance (in shares) at Mar. 31, 2014 48,365,011us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Increase (Decrease) in Shareholders' Equity          
Restricted share award issuances 9,290us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
(9,290)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
     
Restricted share award issuances (in shares) 929,000us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Net income for the period     25,260,782us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
  25,260,782us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Stock-based compensation   2,311,565us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationAndExerciseOfStockOptions
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
    2,311,565us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationAndExerciseOfStockOptions
Balance at Mar. 31, 2015 $ 580,575us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 844,539,059us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
$ 28,094,625us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
  $ 873,214,259us-gaap_StockholdersEquity
Balance (in shares) at Mar. 31, 2015 58,057,493us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember