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Note 4 - Investment Securities - Schedule of Investment Securities (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Available for sale securities, amortized cost | $ 363,433,369 | $ 362,464,561
Available for sale securities, gross unrealized gains | 321,218 | 293,367
Available for sale securities, gross unrealized losses | (10,688,421) | (8,511,024)
Available for Sale, at Fair Value | 353,066,166 | 354,246,904
US Government Agencies Debt Securities [Member] |  |
Available for sale securities, amortized cost | 356,498,339 | 354,931,318
Available for sale securities, gross unrealized gains | 303,360 | 258,049
Available for sale securities, gross unrealized losses | (10,596,527) | (8,465,948)
Available for Sale, at Fair Value | 346,205,172 | 346,723,419
US States and Political Subdivisions Debt Securities [Member] |  |
Available for sale securities, amortized cost | 4,007,883 | 4,493,085
Available for sale securities, gross unrealized gains | 17,858 | 22,835
Available for sale securities, gross unrealized losses | (36,632) | (23,094)
Available for Sale, at Fair Value | 3,989,109 | 4,492,826
Corporate Debt Securities [Member] |  |
Available for sale securities, amortized cost | 2,927,147 | 2,047,517
Available for sale securities, gross unrealized gains |  | 12,483
Available for sale securities, gross unrealized losses | (55,262) |
Available for Sale, at Fair Value | $ 2,871,885 | 2,060,000
Asset-backed Securities [Member] |  |
Available for sale securities, amortized cost |  | 992,641
Available for sale securities, gross unrealized gains |  |
Available for sale securities, gross unrealized losses |  | (21,982)
Available for Sale, at Fair Value |  | $ 970,659

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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