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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 |

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- Definition Number of derivative instrument held during year. + References No definition available. + Details
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- Definition This item represents, as of the balance sheet date; the difference between the gross gains and losses in accumulated other comprehensive income, a separate component of shareholders' equity, for any derivatives that hedged the forecasted acquisition of available-for-sale securities. + References No definition available. + Details
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- Definition The number of derivative instruments of a particular group held by the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959 + Details
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- Definition The cash inflow provided by derivative instruments during the period, which are classified as investing activities, excluding those designated as hedging instruments. + References No definition available. + Details
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