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Financial Instruments (Details) - USD ($)
May 31, 2014
May 31, 2013
ASSETS    
Bonds available for sale $ 6,192,278 $ 5,374,252
Cash and short-term investments 2,708,511 1,570,460
Premiums and other receivables 290,843 300,303
Equity securities (including derivatives) 790,368 455,708
LIABILITIES    
Notes payable 5,220,350 4,847,170
Accounts payable and advance premiums 480,583 538,289
Accrued expenses and other liabilities 6,725,175 3,720,114
Fair Value, Measurements, Recurring [Member]    
ASSETS    
Bonds available for sale 6,305,106 5,472,116
Cash and short-term investments 2,708,511 1,570,460
Premiums and other receivables 290,843 300,303
Equity securities (including derivatives) 816,460 454,639
LIABILITIES    
Notes payable 5,220,350 4,847,170
Accounts payable and advance premiums 480,583 538,289
Accrued expenses and other liabilities $ 6,725,175 $ 3,720,114