XML 34 R35.htm IDEA: XBRL DOCUMENT v2.4.0.6
Fair Value Measurements (Details Textual) (USD $)
 9 Months Ended
Sep. 30, 2012
Fair Value Measurements (Textual) [Abstract]  
Percent of credit loss 4.70%
Rate of return required 5.00%
Estimated timeframe for auctions of securities minimum 3 years
Estimated timeframe for auctions of securities maximum 5 years
Percentage of liquidity risk premium 5.00%
Increase or decrease in the liquidity risk premium 1.00%
Increase or decrease, respectively, the fair value of the Failed Auction Securities $ 300,000