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Note 4 - Investment Securities - Continuous Unrealized Loss Position (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
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Continuous unrealized loss, less than 12 months, fair value | $ 41,703,712 | $ 123,708,343
Continuous unrealized loss, less than 12 months, gross unrealized losses | (528,011) | (1,700,299)
Continuous unrealized loss, greater than 12 months, fair value | 258,492,526 | 190,196,101
Continuous unrealized loss, greater than 12 months, gross unrealized losses | (10,160,410) | (6,810,725)
Continuous unrealized loss, fair value | 300,196,238 | 313,904,444
Continuous unrealized loss, gross unrealized losses | (10,688,421) | (8,511,024)
US Government Agencies Debt Securities [Member] |  |
Continuous unrealized loss, less than 12 months, fair value | 39,082,750 | 120,139,340
Continuous unrealized loss, less than 12 months, gross unrealized losses | (504,496) | (1,655,223)
Continuous unrealized loss, greater than 12 months, fair value | 255,747,472 | 190,196,101
Continuous unrealized loss, greater than 12 months, gross unrealized losses | (10,092,031) | (6,810,725)
Continuous unrealized loss, fair value | 294,830,222 | 310,335,441
Continuous unrealized loss, gross unrealized losses | (10,596,527) | (8,465,948)
US States and Political Subdivisions Debt Securities [Member] |  |
Continuous unrealized loss, less than 12 months, fair value | 611,882 | 2,598,344
Continuous unrealized loss, less than 12 months, gross unrealized losses | (2,668) | (23,094)
Continuous unrealized loss, greater than 12 months, fair value | 1,882,249 |
Continuous unrealized loss, greater than 12 months, gross unrealized losses | (33,964) |
Continuous unrealized loss, fair value | 2,494,131 | 2,598,344
Continuous unrealized loss, gross unrealized losses | (36,632) | (23,094)
Corporate Debt Securities [Member] |  |
Continuous unrealized loss, less than 12 months, fair value | 2,009,080 |
Continuous unrealized loss, less than 12 months, gross unrealized losses | (20,847) |
Continuous unrealized loss, greater than 12 months, fair value | 862,805 |
Continuous unrealized loss, greater than 12 months, gross unrealized losses | (34,415) |
Continuous unrealized loss, fair value | 2,871,885 |
Continuous unrealized loss, gross unrealized losses | $ (55,262) |
Asset-backed Securities [Member] |  |
Continuous unrealized loss, less than 12 months, fair value |  | 970,659
Continuous unrealized loss, less than 12 months, gross unrealized losses |  | (21,982)
Continuous unrealized loss, greater than 12 months, fair value |  |
Continuous unrealized loss, greater than 12 months, gross unrealized losses |  |
Continuous unrealized loss, fair value |  | 970,659
Continuous unrealized loss, gross unrealized losses |  | $ (21,982)

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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