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Note 6 - Investment Securities Available for Sale (Details) - Gross Unrealized Losses and Fair Value - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
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Note 6 - Investment Securities Available for Sale (Details) - Gross Unrealized Losses and Fair Value [Line Items] |  |
Less than Twelve Months, Fair Value | $ 17,673 | $ 13,811
Less than Twelve Months, Gross Unrealized Losses | (139) | (152)
Twelve Months or Greater, Fair Value | 15,713 | 26,951
Twelve Months or Greater, Gross Unrealized Losses | (229) | (566)
Total, Fair Value | 33,386 | 40,762
Total, Gross Unrealized Losses | (368) | (718)
US Government Agencies Debt Securities [Member] |  |
Note 6 - Investment Securities Available for Sale (Details) - Gross Unrealized Losses and Fair Value [Line Items] |  |
Less than Twelve Months, Fair Value | 4,565 | 3,818
Less than Twelve Months, Gross Unrealized Losses | (9) | (57)
Twelve Months or Greater, Fair Value | 7,612 | 10,872
Twelve Months or Greater, Gross Unrealized Losses | (67) | (214)
Total, Fair Value | 12,177 | 14,690
Total, Gross Unrealized Losses | (76) | (271)
US States and Political Subdivisions Debt Securities [Member] |  |
Note 6 - Investment Securities Available for Sale (Details) - Gross Unrealized Losses and Fair Value [Line Items] |  |
Less than Twelve Months, Fair Value | 8,999 |
Less than Twelve Months, Gross Unrealized Losses | (122) |
Twelve Months or Greater, Fair Value | 1,426 |
Twelve Months or Greater, Gross Unrealized Losses | (52) |
Total, Fair Value | 10,425 |
Total, Gross Unrealized Losses | (174) |
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Note 6 - Investment Securities Available for Sale (Details) - Gross Unrealized Losses and Fair Value [Line Items] |  |
Less than Twelve Months, Fair Value | 4,000 | 8,725
Less than Twelve Months, Gross Unrealized Losses | (7) | (86)
Twelve Months or Greater, Fair Value | 6,675 | 6,685
Twelve Months or Greater, Gross Unrealized Losses | (110) | (186)
Total, Fair Value | 10,675 | 15,410
Total, Gross Unrealized Losses | (117) | (272)
Mortgage-backed Securities, Issued by Private Enterprises [Member] |  |
Note 6 - Investment Securities Available for Sale (Details) - Gross Unrealized Losses and Fair Value [Line Items] |  |
Less than Twelve Months, Fair Value | 109 |
Less than Twelve Months, Gross Unrealized Losses | (1) |
Total, Fair Value | 109 |
Total, Gross Unrealized Losses | $ (1) |
Tax-exempt [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Note 6 - Investment Securities Available for Sale (Details) - Gross Unrealized Losses and Fair Value [Line Items] |  |
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)

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