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Note 6 - Investment Securities Available for Sale - Gross Unrealized Losses and Fair Value (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Total, Fair Value $ 21,284 $ 42,679
Total, Gross Unrealized Losses (226) (883)
Less than Twelve Months, Fair Value 15,565 36,925
Less than Twelve Months, Gross Unrealized Losses (96) (699)
Twelve Months or Greater, Fair Value 5,719 5,754
Twelve Months or Greater, Gross Unrealized Losses (130) (184)
US Government Agencies Debt Securities [Member]    
Total, Fair Value 4,315 5,119
Total, Gross Unrealized Losses (49) (96)
Less than Twelve Months, Fair Value 3,055 3,803
Less than Twelve Months, Gross Unrealized Losses (17) (47)
Twelve Months or Greater, Fair Value 1,260 1,316
Twelve Months or Greater, Gross Unrealized Losses (32) (49)
US States and Political Subdivisions Debt Securities [Member] | Taxable [Member]    
Total, Fair Value 505 502
Total, Gross Unrealized Losses (2) (4)
Less than Twelve Months, Fair Value 505 502
Less than Twelve Months, Gross Unrealized Losses (2) (4)
Twelve Months or Greater, Fair Value
Twelve Months or Greater, Gross Unrealized Losses
US States and Political Subdivisions Debt Securities [Member] | Tax Exempt [Member]    
Total, Fair Value 4,885 23,554
Total, Gross Unrealized Losses (40) (522)
Less than Twelve Months, Fair Value 4,574 23,554
Less than Twelve Months, Gross Unrealized Losses (40) (522)
Twelve Months or Greater, Fair Value 311 0
Twelve Months or Greater, Gross Unrealized Losses
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Total, Fair Value 11,579 13,504
Total, Gross Unrealized Losses (135) (261)
Less than Twelve Months, Fair Value 7,431 9,066
Less than Twelve Months, Gross Unrealized Losses (37) (126)
Twelve Months or Greater, Fair Value 4,148 4,438
Twelve Months or Greater, Gross Unrealized Losses $ (98) $ (135)