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Note 4 - Investment Securities (Tables) | 12 Months Ended
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Dec. 31, 2018
Notes Tables |
Marketable Securities [Table Text Block] |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
Securities Available for Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government Agencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-Backed |  | $ | 356,498,339 |  |  | $ | 303,360 |  |  | $ | (10,596,527 | ) |  | $ | 346,205,172 |
State, County and Municipal |  |  | 4,007,883 |  |  |  | 17,858 |  |  |  | (36,632 | ) |  |  | 3,989,109 |
Corporate |  |  | 2,927,147 |  |  |  | - |  |  |  | (55,262 | ) |  |  | 2,871,885 |
|  | $ | 363,433,369 |  |  | $ | 321,218 |  |  | $ | (10,688,421 | ) |  | $ | 353,066,166 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
Securities Available for Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government Agencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-Backed |  | $ | 354,931,318 |  |  | $ | 258,049 |  |  | $ | (8,465,948 | ) |  | $ | 346,723,419 |
State, County and Municipal |  |  | 4,493,085 |  |  |  | 22,835 |  |  |  | (23,094 | ) |  |  | 4,492,826 |
Corporate |  |  | 2,047,517 |  |  |  | 12,483 |  |  |  | - |  |  |  | 2,060,000 |
Asset-Backed |  |  | 992,641 |  |  |  | - |  |  |  | (21,982 | ) |  |  | 970,659 |
|  | $ | 362,464,561 |  |  | $ | 293,367 |  |  | $ | (8,511,024 | ) |  | $ | 354,246,904 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | Securities |
|  | Available for Sale |
|  | Amortized Cost |  |  | Fair Value |
Due in One Year or Less |  | $ | 354,440 |  |  | $ | 353,794 |
Due After One Year Through Five Years |  |  | 4,294,198 |  |  |  | 4,237,813 |
Due After Five Years Through Ten Years |  |  | 1,133,881 |  |  |  | 1,150,770 |
Due After Ten Years |  |  | 1,152,511 |  |  |  | 1,118,617 |
|  | $ | 6,935,030 |  |  | $ | 6,860,994 |
Mortgage-Backed Securities |  |  | 356,498,339 |  |  |  | 346,205,172 |
|  | $ | 363,433,369 |  |  | $ | 353,066,166 |
Schedule of Unrealized Loss on Investments [Table Text Block] |
|  | Less Than 12 Months |  |  | 12 Months or Greater |  |  | Total |
|  | Fair Value |  |  | Gross Unrealized Losses |  |  | Fair Value |  |  | Gross Unrealized Losses |  |  | Fair Value |  |  | Gross Unrealized Losses |
December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government Agencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-Backed |  | $ | 39,082,750 |  |  | $ | (504,496 | ) |  | $ | 255,747,472 |  |  | $ | (10,092,031 | ) |  | $ | 294,830,222 |  |  | $ | (10,596,527 | )
State, County and Municipal |  |  | 611,882 |  |  |  | (2,668 | ) |  |  | 1,882,249 |  |  |  | (33,964 | ) |  |  | 2,494,131 |  |  |  | (36,632 | )
Corporate |  |  | 2,009,080 |  |  |  | (20,847 | ) |  |  | 862,805 |  |  |  | (34,415 | ) |  |  | 2,871,885 |  |  |  | (55,262 | )
|  | $ | 41,703,712 |  |  | $ | (528,011 | ) |  | $ | 258,492,526 |  |  | $ | (10,160,410 | ) |  | $ | 300,196,238 |  |  | $ | (10,688,421 | )
December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government Agencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-Backed |  | $ | 120,139,340 |  |  | $ | (1,655,223 | ) |  | $ | 190,196,101 |  |  | $ | (6,810,725 | ) |  | $ | 310,335,441 |  |  | $ | (8,465,948 | )
State, County and Municipal |  |  | 2,598,344 |  |  |  | (23,094 | ) |  |  | - |  |  |  | - |  |  |  | 2,598,344 |  |  |  | (23,094 | )
Asset – Backed |  |  | 970,659 |  |  |  | (21,982 | ) |  |  | - |  |  |  | - |  |  |  | 970,659 |  |  |  | (21,982 | )
|  | $ | 123,708,343 |  |  | $ | (1,700,299 | ) |  | $ | 190,196,101 |  |  | $ | (6,810,725 | ) |  | $ | 313,904,444 |  |  | $ | (8,511,024 | )

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