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Investments In Securities And Fair Value (Schedule Of Gross Unrealized Gains And Losses And Amortized Cost For Securities) (Details) (USD $) | Dec. 31, 2012 | Dec. 31, 2011
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Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Available-for-sale, at fair value, Amortized Cost | $ 75,573,673 | $ 78,783,968
Available-for-sale, at fair value, Gross Unrealized Gains | 6,388,510 | 6,785,882
Available-for-sale, at fair value, Gross Unrealized Losses | 25,205 | 162,485
Available-for-sale, at fair value, Estimated Fair Value | 81,936,978 | 85,407,365
Equity Securities, available-for-sale at fair value, Amortized Cost | 21,229,114 | 17,652,745
Equity Securities, available-for-sale at fair value, Gross Unrealized Gains | 7,373,056 | 4,939,053
Equity Securities, available-for-sale at fair value, Gross Unrealized Losses | 91,237 | 41,823
Equity Securities, available-for-sale at fair value, Estimated Fair Value | 28,510,933 | 22,549,975
Short-term investments, Amortized Cost | 13,567,648 | 14,112,262
Short-term investments, Gross Unrealized Gains | 0 | 0
Short-term investments, Gross Unrealized Losses | 0 | 0
Short-term investments, Estimated Fair Value | 13,567,648 | 14,112,262
General Obligations Of U.S. States, Territories And Political Subdivisions [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Available-for-sale, at fair value, Amortized Cost | 38,658,463 | 41,469,367
Available-for-sale, at fair value, Gross Unrealized Gains | 3,211,445 | 3,595,144
Available-for-sale, at fair value, Gross Unrealized Losses | 0 | 64
Available-for-sale, at fair value, Estimated Fair Value | 41,869,908 | 45,064,447
Issuer Obligations Of U.S. States, Territories And Political Subdivisions Special Revenue [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Available-for-sale, at fair value, Amortized Cost | 18,933,299 | 20,573,562
Available-for-sale, at fair value, Gross Unrealized Gains | 1,909,106 | 1,988,589
Available-for-sale, at fair value, Gross Unrealized Losses | 10,455 | 13,805
Available-for-sale, at fair value, Estimated Fair Value | 20,831,950 | 22,548,346
Corporate Debt Securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Available-for-sale, at fair value, Amortized Cost | 17,064,697 | 12,188,639
Available-for-sale, at fair value, Gross Unrealized Gains | 1,252,973 | 1,202,149
Available-for-sale, at fair value, Gross Unrealized Losses | 14,750 | 148,616
Available-for-sale, at fair value, Estimated Fair Value | 18,302,920 | 13,242,172
Auction Rate Securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Available-for-sale, at fair value, Amortized Cost | 917,214 | 4,552,400
Available-for-sale, at fair value, Gross Unrealized Gains | 14,986 | 0
Available-for-sale, at fair value, Gross Unrealized Losses | 0 | 0
Available-for-sale, at fair value, Estimated Fair Value | 932,200 | 4,552,400
Common Stocks And Nonredeemable Preferred Stocks [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Equity Securities, available-for-sale at fair value, Amortized Cost | 21,229,114 | 17,652,745
Equity Securities, available-for-sale at fair value, Gross Unrealized Gains | 7,373,056 | 4,939,053
Equity Securities, available-for-sale at fair value, Gross Unrealized Losses | 91,237 | 41,823
Equity Securities, available-for-sale at fair value, Estimated Fair Value | 28,510,933 | 22,549,975
Certificates Of Deposit And Other [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Short-term investments, Amortized Cost | 13,567,648 | 14,112,262
Short-term investments, Gross Unrealized Gains | 0 | 0
Short-term investments, Gross Unrealized Losses | 0 | 0
Short-term investments, Estimated Fair Value | $ 13,567,648 | $ 14,112,262

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- Definition This item represents the cost of equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments for other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 7 -Footnote 2 -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. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 19 -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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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph b -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. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 + Details
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