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RELATED PARTY TRANSACTIONS (Details Textual) (USD $)	3 Months Ended	6 Months Ended
RELATED PARTY TRANSACTIONS (Details Textual) (USD $)	Oct. 31, 2014	Oct. 31, 2014	Apr. 30, 2014
Related Party Transaction [Line Items]
Accounts receivable	$ 10,217,958us-gaap_AccountsReceivableNetCurrent	$ 10,217,958us-gaap_AccountsReceivableNetCurrent	$ 8,614,396us-gaap_AccountsReceivableNetCurrent
Taian Gas Group and Subsidiaries [Member]
Related Party Transaction [Line Items]
Revenue from Related Parties	450,000	733,000
Accounts receivable	$ 65,000	$ 65,000	$ 0

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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