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Note 3 - Investment Securities (Details) - Investment Securities in a Continuous Unrealized Loss Position - USD ($) | Dec. 31, 2015 | Dec. 31, 2014
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U.S. Government Agencies |  |
Continous unrealized loss, less than 12 months, fair value | $ 140,799,638 | $ 66,609,319
Continous unrealized loss, less than 12 months, gross unrealized losses | (1,290,244) | (396,896)
Continous unrealized loss, greater than 12 months, fair value | 139,720,125 | 185,025,099
Continous unrealized loss, greater than 12 months, gross unrealized losses | (5,521,826) | (7,127,056)
Continous unrealized loss, fair value | 280,519,763 | 251,634,418
Continous unrealized loss, gross unrealized losses | (6,812,070) | (7,523,952)
US Government Agencies Debt Securities [Member] |  |
U.S. Government Agencies |  |
Continous unrealized loss, less than 12 months, fair value | 139,765,025 | 66,609,319
Continous unrealized loss, less than 12 months, gross unrealized losses | (1,270,011) | (396,896)
Continous unrealized loss, greater than 12 months, fair value | 139,720,125 | 183,645,552
Continous unrealized loss, greater than 12 months, gross unrealized losses | (5,521,826) | (7,114,392)
Continous unrealized loss, fair value | 279,485,150 | 250,254,871
Continous unrealized loss, gross unrealized losses | (6,791,837) | (7,511,288)
US States and Political Subdivisions Debt Securities [Member] |  |
U.S. Government Agencies |  |
Continous unrealized loss, less than 12 months, fair value | 1,034,613 |
Continous unrealized loss, less than 12 months, gross unrealized losses | (20,233) |
Continous unrealized loss, greater than 12 months, fair value |  | 1,379,547
Continous unrealized loss, greater than 12 months, gross unrealized losses |  | (12,664)
Continous unrealized loss, fair value | 1,034,613 | 1,379,547
Continous unrealized loss, gross unrealized losses | $ (20,233) | $ (12,664)

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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