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Summary of Significant Accounting Policies (Details 3) (Tax-Advantaged Bond Fund [Member], USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Tax-Advantaged Bond Fund [Member]
 
Available-for-sale Debt Securities, Amortized Cost Basis $ 1,000
Available-for-sale Securities, Gross Unrealized Gain (Loss) 59
Available-for-sale Securities, Fair Value Disclosure $ 1,059