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Note 2 - Investment Securities - Continuous Unrealized Loss Position (Details) - USD ($) | Jun. 30, 2017 | Dec. 31, 2016
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Continuous unrealized loss, greater than 12 months, gross unrealized losses | $ (3,749) | $ (4,213)
Continuous unrealized loss, fair value | 280,473 | 285,171
Continuous unrealized loss, gross unrealized losses | (6,275) | (7,703)
Continuous unrealized loss, less than 12 months, fair value | 172,188 | 177,689
Continuous unrealized loss, less than 12 months, gross unrealized losses | (2,526) | (3,490)
Continuous unrealized loss, greater than 12 months, fair value | 108,285 | 107,482
US Government Agencies Debt Securities [Member] |  |
Continuous unrealized loss, greater than 12 months, gross unrealized losses | (3,749) | (4,213)
Continuous unrealized loss, fair value | 278,697 | 281,683
Continuous unrealized loss, gross unrealized losses | (6,248) | (7,673)
Continuous unrealized loss, less than 12 months, fair value | 170,412 | 174,201
Continuous unrealized loss, less than 12 months, gross unrealized losses | (2,499) | (3,460)
Continuous unrealized loss, greater than 12 months, fair value | 108,285 | 107,482
US States and Political Subdivisions Debt Securities [Member] |  |
Continuous unrealized loss, greater than 12 months, gross unrealized losses |  |
Continuous unrealized loss, fair value | 1,776 | 3,488
Continuous unrealized loss, gross unrealized losses | (27) | (30)
Continuous unrealized loss, less than 12 months, fair value | 1,776 | 3,488
Continuous unrealized loss, less than 12 months, gross unrealized losses | (27) | (30)
Continuous unrealized loss, greater than 12 months, fair value |  |

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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=82897076&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=82897076&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=82897076&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=82897076&loc=d3e27290-111563 + Details
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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 less than twelve months. + 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=82897076&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=82897076&loc=d3e27337-111563 + Details
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