Variable Interest Entities ("vies") (Details) (USD $)	12 Months Ended
	May 31, 2013	May 31, 2012	May 31, 2011
Cash and cash equivalents	$ 5,479,091	$ 3,520,248	$ 4,580,189
Inventories	10,621	18,385
Accounts receivable	2,398,488	633,009
Other receivables and deposits	434,606	383,443
Goodwill	610,386	610,386
Property, plant and equipment, net	1,900,561	2,367,320
Accounts payable	3,751,360	715,078
Taxes payable	718,042	450,700
Revenue	7,220,840	8,423,049
Other income and gains	141,560	209,154
Service costs	4,729,921	5,224,044
Personnel cost	818,713	1,232,640
Depreciation expense	651,531	647,538
Provision for income taxes	284,680	329,938
Net income	49,405	257,986
Variable Interest Entity, Primary Beneficiary
Cash and cash equivalents	1,945,614	3,466,743
Inventories	10,621	18,385
Accounts receivable	2,392,819	633,009
Income Taxes Receivable	23,323	22,755
Other receivables and deposits	283,603	237,490
Goodwill	610,386	610,386
Property, plant and equipment, net	285,823	454,875
Variable Interest Entity, Consolidated, Carrying Amount, Assets	5,552,189	5,443,643
Deferred Revenue, Current	867,804	1,441,347
Accounts payable	3,730,907	694,626
Accounts Payable and Other Accrued Liabilities, Current	379,035	467,246
Taxes payable	31,188	44,424
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities	5,008,934	2,647,643
Revenue	6,620,495	8,380,973
Other income and gains	84,882	189,213
Service costs	4,688,240	5,169,715
Personnel cost	663,613	1,231,423
Depreciation expense	220,243	647,444
Other Operating Income (Expense), Net	363,008	663,076
Income (Loss) from Continuing Operations before Income Taxes, Domestic	770,273	858,528
Provision for income taxes	284,680	329,938
Net income	$ 485,593	$ 528,590