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Note 3 - Investment Securities - Investment Securities (Details) - USD ($)
Sep. 30, 2016
Dec. 31, 2015
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Amortized Cost $ 98,359,000 $ 42,158,000
Gross Unrealized Gains 728,000 123,000
Gross Unrealized Losses 35,000 271,000
Fair Value 99,052,000 42,010,000
Amortized Cost 3,000 4,000
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 3,000 4,000
Agency Collateralized Mortgage Obligations [Member]    
Amortized Cost 17,195,000 9,391,000
Gross Unrealized Gains 89,000 41,000
Gross Unrealized Losses 59,000 101,000
Fair Value 17,225,000 9,331,000
US Government Agencies Debt Securities [Member]    
Amortized Cost 72,399,000 84,797,000
Gross Unrealized Gains 117,000 11,000
Gross Unrealized Losses 55,000 355,000
Fair Value 72,461,000 84,453,000
Municipal Notes [Member]    
Amortized Cost 56,576,000 49,527,000
Gross Unrealized Gains 1,943,000 1,372,000
Gross Unrealized Losses 110,000 60,000
Fair Value 58,409,000 50,839,000
Debt Securities [Member]    
Amortized Cost 244,529,000 185,873,000
Gross Unrealized Gains 2,877,000 1,547,000
Gross Unrealized Losses 259,000 787,000
Fair Value 247,147,000 186,633,000
Amortized Cost 3,000  
Fair Value 3,000  
Mutual Funds [Member]    
Amortized Cost 103,000 118,000
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 103,000 118,000
Amortized Cost 244,632,000 185,991,000
Gross Unrealized Gains 2,877,000 1,547,000
Gross Unrealized Losses 259,000 787,000
Fair Value 247,250,000 186,751,000
Amortized Cost 3,000 4,000
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value $ 3,000 $ 4,000