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RELATED PARTY TRANSACTIONS (Details Textual) (USD $)	12 Months Ended
RELATED PARTY TRANSACTIONS (Details Textual) (USD $)	Apr. 30, 2013	Apr. 30, 2012
Operating Leases, Rent Expense	$ 491,000	$ 570,000
Real Estate Property Transfer Value	449,660
Noncontrolling Interest Booked Value	200,766
Trenton Operations [Member]
Operating Leases, Rent Expense	12,600	69,600
Pride Group Pty Limited [Member]
Operating Leases, Rent Expense	64,333	62,181
Taian Gas Group and Subsidiaries [Member]
Recorded Amount Of Accounts Receivable	647,518
Revenue from Related Parties	1,345,524	1,274,774
Accounts Receivable, Related Parties	$ 117,751	$ 625,919

For an unclassified balance sheet, amount of receivables arising from transactions with related parties.

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- Definition

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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