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Retirement and Death Benefit Plans (Details Textual) (USD $)
 12 Months Ended
May 31, 2013
May 31, 2012
Retirement and Death Benefit Plans (Textual) [Abstract]    
Employee retirement or disability, period over which benefits are to be paid 10 years  
Life insurance contracts, discounting rate for present value calculation 4.00% 4.50%
Life insurance contracts, current and non current amounts recognized in balance Sheet $ 6,309,000 $ 6,316,000
Life insurance contracts, amount charged to operations $ 187,000 $ 414,000