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Commitments and Contingencies (Details Textual) (USD $)
12 Months Ended
May 31, 2013
Homes
May 31, 2012
Commitments and Contingencies (Additional Textual) [Abstract]    
Maximum potential repurchase liability $ 71,000,000 $ 64,000,000
Other accrued liabilities 100,000 100,000
Number of homes to be manufactured and sold 60  
Total lease expenses 372,000 440,000
Minimum [Member]
   
Commitments and Contingencies (Textual) [Abstract]    
Period to potentially repurchase units 12 months  
Maximum [Member]
   
Commitments and Contingencies (Textual) [Abstract]    
Period to potentially repurchase units 24 months  
Certificate of deposit [Member]
   
Commitments and Contingencies (Textual) [Abstract]    
Certificate of deposit pledged $ 600,000