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Note 3 - Investment Securities (Details) - USD ($)
Jun. 30, 2016
Dec. 31, 2015
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Amortized Cost $ 86,056,000 $ 42,158,000
Gross Unrealized Gains 644,000 123,000
Gross Unrealized Losses 35,000 271,000
Fair Value 86,665,000 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 17,092,000 9,391,000
Gross Unrealized Gains 135,000 41,000
Gross Unrealized Losses 19,000 101,000
Fair Value 17,208,000 9,331,000
US Government Agencies Debt Securities [Member]    
Amortized Cost 86,846,000 84,797,000
Gross Unrealized Gains 192,000 11,000
Gross Unrealized Losses 20,000 355,000
Fair Value 87,018,000 84,453,000
Municipal Notes [Member]    
Amortized Cost 52,310,000 49,527,000
Gross Unrealized Gains 2,345,000 1,372,000
Gross Unrealized Losses 2,000 60,000
Fair Value 54,653,000 50,839,000
Debt Securities [Member]    
Amortized Cost 242,304,000 185,873,000
Gross Unrealized Gains 3,316,000 1,547,000
Gross Unrealized Losses 76,000 787,000
Fair Value 245,544,000 186,633,000
Amortized Cost 3,000  
Fair Value 3,000  
Mutual Funds [Member]    
Amortized Cost 4,060,000 118,000
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 4,060,000 118,000
Amortized Cost 246,364,000 185,991,000
Gross Unrealized Gains 3,316,000 1,547,000
Gross Unrealized Losses 76,000 787,000
Fair Value 249,604,000 186,751,000
Amortized Cost 3,000 4,000
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value $ 3,000 $ 4,000