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Note 2 - Investment Securities - Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($) | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Due in one year or less | $ 7,479,990 |
Due in one year or less | 7,478,528 |
Due after one year through five years | 18,040,753 |
Due after one year through five years | 18,137,483 |
Due after five years | 298,682,891 |
Due after five years | 297,373,366 |
| 324,203,634 |
| 322,989,377 | $ 320,414,899
Due in one year or less | 3,498,188 |
Due in one year or less | 3,504,089 |
Due after one year through five years | 31,550,278 |
Due after one year through five years | 31,700,139 |
Due after five years | 64,870,032 |
Due after five years | 64,840,746 |
| 99,918,498 |
| 100,044,974 |
| 270,047,939 |
| 269,281,713 |
Callable Securities [Member] |  |
| 46,183,946 |
| 46,135,385 |
US States and Political Subdivisions Debt Securities [Member] |  |
| 321,939,377 | 319,364,899
US States and Political Subdivisions Debt Securities [Member] | Callable Securities [Member] |  |
Amortized Cost | 41,135,349 |
Fair Value | 41,095,251 |
US Government-sponsored Enterprises Debt Securities [Member] | Callable Securities [Member] |  |
Amortized Cost | 5,048,597 |
Fair Value | 5,040,134 |
Residential Mortgage Backed Securities [Member] |  |
Amortized Cost | 166,063,973 |
Fair Value | 164,414,833 |
Other Securities [Member] |  |
| 1,050,000 | $ 1,050,000
Amortized Cost | 4,065,468 |
Fair Value | 4,821,906 |
Callable Securities [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Amortized Cost | 170,556,294 |
Fair Value | $ 170,715,228 |

X
- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount after adjustments of available-for-sale debt securities at cost, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27198-111563 + Details
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