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Investments In Securities (Schedule Of Gross Realized Gains And Losses On Securities) (Details) - USD ($) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Total, Gross realized gains |  |  | $ 357,630 | $ 945,563
Total, Gross realized losses |  |  | (233,276) | (24,700)
Net realized gain from securities |  |  | 124,354 | 920,863
Gain on other investments |  |  | 10,648 | 19,104
Total |  |  | 10,648 | 19,104
Net realized gain on investments | $ (14,828) | $ 925,164 | 135,002 | 939,967
General Obligations Of U.S. States, Territories And Political Subdivisions |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Total, Gross realized losses |  |  | 0 | (12,319)
Issuer Obligations Of U S States Territories And Political Subdivisions Special Revenue [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Total, Gross realized gains |  |  | 160 | 0
Total, Gross realized losses |  |  | (1,085) | (398)
Corporate Debt Securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Total, Gross realized gains |  |  | 20 | 999
Common Stocks And Nonredeemable Preferred Stocks |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Total, Gross realized gains |  |  | 282,454 | 944,564
Total, Gross realized losses |  |  | (116,953) | (834)
Impairments of Debt And Equity Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Total, Gross realized losses |  |  | (115,238) | (11,149)
Auction Rate Securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Total, Gross realized gains |  |  | $ 74,996 | $ 0

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- Definition This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity 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=73527792&loc=d3e27357-111563 + Details
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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=73527792&loc=d3e27357-111563 + Details
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- Definition This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting and losses recognized for other than temporary impairments (OTTI) of the subject investments. + 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 (c)-(e) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27357-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(c),9(a)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27405-111563 + Details
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- Definition The net realized gains or losses on investments during the period, not including gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3(a)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 325 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6485959&loc=d3e22529-158502 + Details
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