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Investments (Details Textual) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Contract
Jun. 30, 2011
Contract
Jun. 30, 2012
Contract
Jun. 30, 2011
Contract
Investments (Textual) [Abstract]        
Gross realized gains and losses from equity option contracts   $ 22,000   $ 73,000
Net Proceeds from Equity Option Contracts   $ 22,000   $ 73,000
Option Contract at Balance Sheet Date   0   0
Number of Option Contract held during the year 0   0