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Financial Assets Measured at Fair Value on Recurring Basis (Detail) (Fair Value, Measurements, Recurring, USD $)
Jun. 30, 2012
Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities $ 19,436,000 $ 19,538,000
Cash equivalents 1,241,000 803,000
Total Assets 20,677,000 20,341,000
Fair Value, Inputs, Level 1
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities 19,436,000 19,538,000
Cash equivalents 1,241,000 803,000
Total Assets $ 20,677,000 $ 20,341,000