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Note 6 - Gross Unrealized Losses and Fair Value (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
US Government Agencies Debt Securities [Member] |  |
Less than Twelve Months, Fair Value |  | $ 3,818
Less than Twelve Months, Gross Unrealized Losses |  | (57)
Twelve Months or Greater, Fair Value | 1,469 | 10,872
Twelve Months or Greater, Gross Unrealized Losses | (10) | (214)
Total, Fair Value | 1,469 | 14,690
Total, Gross Unrealized Losses | (10) | (271)
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Less than Twelve Months, Fair Value |  | 8,725
Less than Twelve Months, Gross Unrealized Losses |  | (86)
Twelve Months or Greater, Fair Value | 6,309 | 6,685
Twelve Months or Greater, Gross Unrealized Losses | (50) | (186)
Total, Fair Value | 6,309 | 15,410
Total, Gross Unrealized Losses | (50) | (272)
US States and Political Subdivisions Debt Securities [Member] | Tax Exempt [Member] |  |
Less than Twelve Months, Fair Value |  | 1,268
Less than Twelve Months, Gross Unrealized Losses |  | (9)
Twelve Months or Greater, Fair Value |  | 9,394
Twelve Months or Greater, Gross Unrealized Losses |  | (166)
Total, Fair Value |  | 10,662
Total, Gross Unrealized Losses |  | (175)
Mortgage-backed Securities, Issued by Private Enterprises [Member] |  |
Less than Twelve Months, Fair Value | 94 |
Less than Twelve Months, Gross Unrealized Losses | (1) |
Total, Fair Value | 94 |
Total, Gross Unrealized Losses | (1) |
Less than Twelve Months, Fair Value | 94 | 13,811
Less than Twelve Months, Gross Unrealized Losses | (1) | (152)
Twelve Months or Greater, Fair Value | 7,778 | 26,951
Twelve Months or Greater, Gross Unrealized Losses | (60) | (566)
Total, Fair Value | 7,872 | 40,762
Total, Gross Unrealized Losses | $ (61) | $ (718)

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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=73527792&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=73527792&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=73527792&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=73527792&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=73527792&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=73527792&loc=d3e27337-111563 + Details
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