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Industry Segment Information (Details 1) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
May 31, 2013
May 31, 2012
Operating assets    
Total operating assets $ 63,927 $ 61,858
U.S. Treasury Bills, at cost plus accrued interest. 4,000 16,998
Total Assets 67,927 78,856
DEPRECIATION    
Total depreciation 2,002 2,359
CAPITAL EXPENDITURES    
Total capital expenditures 75 614
Housing [Member]
    
Operating assets    
Total operating assets 45,072 40,985
DEPRECIATION    
Total depreciation 1,490 1,762
CAPITAL EXPENDITURES    
Total capital expenditures 48 450
Recreational vehicles [Member]
    
Operating assets    
Total operating assets 18,855 20,873
DEPRECIATION    
Total depreciation 512 597
CAPITAL EXPENDITURES    
Total capital expenditures $ 27 $ 164