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Commitments and Contingencies (Details) (USD $)
3 Months Ended 6 Months Ended
Nov. 30, 2012
Homes
Nov. 30, 2011
May 31, 2012
Nov. 30, 2012
Minimum [Member]
Nov. 30, 2012
Maximum [Member]
Nov. 30, 2012
Certificate of deposit [Member]
Commitments and Contingencies (Textual) [Abstract]            
Period to potentially repurchase units       12 months 24 months  
Certificate of deposit pledged           $ 600,000
Commitments and Contingencies (Additional Textual) [Abstract]            
Maximum potential repurchase liability 72,000,000   64,000,000      
Net losses from repurchased units 0 0        
Obligations from repurchased units $ 0 $ 0        
Number of homes to be manufactured and sold 60