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Investments (Narrative) (Details) (USD $) | 6 Months Ended
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Jun. 30, 2013 | Jun. 30, 2012
Schedule of Available-for-sale Securities [Line Items] |  |
Proceeds from sale of investments | $ 1,948,839 | $ 658,233
Gross realized gains | 151,472 | 37,405
Gross realized losses | $ 30,192 | $ 15,014
Corporate Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Number Of Investment Securities | 3 |

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- Definition This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27357-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 21 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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