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Industry Segment Information - Schedule Representing Reconciliation of Assets (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
May 31, 2014
May 31, 2013
Operating assets    
Total operating assets $ 65,754 $ 63,927
U.S. Treasury bills 0 4,000
Total Assets 65,754 67,927
DEPRECIATION    
Total depreciation 1,716 2,002
CAPITAL EXPENDITURES    
Total capital expenditures 753 75
Housing [Member]
    
Operating assets    
Total operating assets 51,625 45,072
DEPRECIATION    
Total depreciation 1,359 1,490
CAPITAL EXPENDITURES    
Total capital expenditures 722 48
Recreational Vehicles [Member]
    
Operating assets    
Total operating assets 14,129 18,855
DEPRECIATION    
Total depreciation 357 512
CAPITAL EXPENDITURES    
Total capital expenditures $ 31 $ 27