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Note 3 - Investment Securities Available for Sale - Gross Unrealized Losses and Fair Value (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Less than Twelve Months, Fair Value $ 36,925 $ 13,811
Less than Twelve Months, Gross Unrealized Losses (699) (152)
Twelve Months or Greater, Fair Value 5,754 26,951
Twelve Months or Greater, Gross Unrealized Losses (184) (566)
Total, Fair Value 42,679 40,762
Total, Gross Unrealized Losses (883) (718)
US Government Agencies Debt Securities [Member]    
Less than Twelve Months, Fair Value 3,803 3,818
Less than Twelve Months, Gross Unrealized Losses (47) (57)
Twelve Months or Greater, Fair Value 1,316 10,872
Twelve Months or Greater, Gross Unrealized Losses (49) (214)
Total, Fair Value 5,119 14,690
Total, Gross Unrealized Losses (96) (271)
US States and Political Subdivisions Debt Securities [Member] | Tax Exempt [Member]    
Less than Twelve Months, Fair Value 23,554 1,268
Less than Twelve Months, Gross Unrealized Losses (522) (9)
Twelve Months or Greater, Fair Value 0 9,394
Twelve Months or Greater, Gross Unrealized Losses (166)
Total, Fair Value 23,554 10,662
Total, Gross Unrealized Losses (522) (175)
US States and Political Subdivisions Debt Securities [Member] | Taxable [Member]    
Less than Twelve Months, Fair Value 502  
Less than Twelve Months, Gross Unrealized Losses (4)  
Twelve Months or Greater, Fair Value  
Twelve Months or Greater, Gross Unrealized Losses  
Total, Fair Value 502  
Total, Gross Unrealized Losses (4)  
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Less than Twelve Months, Fair Value 9,066 8,725
Less than Twelve Months, Gross Unrealized Losses (126) (86)
Twelve Months or Greater, Fair Value 4,438 6,685
Twelve Months or Greater, Gross Unrealized Losses (135) (186)
Total, Fair Value 13,504 15,410
Total, Gross Unrealized Losses $ (261) $ (272)