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Note 4 - Investment Securities (Details) - Investment Securities - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Securities available for sale:    
Securities available for sale, at fair value $ 186,751 $ 100,226
Securities held to maturity:    
Securities available for sale, Amortized Cost 4 6
Securities available for sale, Gross Unrealized Gains 0 0
Securities available for sale, Gross Unrealized Losses 0 0
Securities available for sale, Fair Value 4 6
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Securities available for sale:    
Securities available for sale, Amortized Cost 42,158 32,135
Securities available for sale, Gross Unrealized Gains 123 240
Securities available for sale, Gross Unrealized Losses 271 79
Securities available for sale, at fair value 42,010 32,296
Securities held to maturity:    
Securities available for sale, Amortized Cost 4  
Securities available for sale, Gross Unrealized Gains 0  
Securities available for sale, Gross Unrealized Losses 0  
Securities available for sale, Fair Value 4  
Agency Collateralized Mortgage Obligations [Member]    
Securities available for sale:    
Securities available for sale, Amortized Cost 9,391 14,461
Securities available for sale, Gross Unrealized Gains 41 74
Securities available for sale, Gross Unrealized Losses 101 150
Securities available for sale, at fair value 9,331 14,385
US Government Agencies Debt Securities [Member]    
Securities available for sale:    
Securities available for sale, Amortized Cost 84,797 18,136
Securities available for sale, Gross Unrealized Gains 11 32
Securities available for sale, Gross Unrealized Losses 355 48
Securities available for sale, at fair value 84,453 18,120
Municipal Notes [Member]    
Securities available for sale:    
Securities available for sale, Amortized Cost 49,527 32,178
Securities available for sale, Gross Unrealized Gains 1,372 1,242
Securities available for sale, Gross Unrealized Losses 60 78
Securities available for sale, at fair value 50,839 33,342
Debt Securities [Member]    
Securities available for sale:    
Securities available for sale, Amortized Cost 185,873 96,910
Securities available for sale, Gross Unrealized Gains 1,547 1,588
Securities available for sale, Gross Unrealized Losses 787 355
Securities available for sale, at fair value 186,633 98,143
Securities held to maturity:    
Securities available for sale, Amortized Cost 4  
Securities available for sale, Fair Value 4  
Mutual Funds [Member]    
Securities available for sale:    
Securities available for sale, Amortized Cost 118 2,083
Securities available for sale, Gross Unrealized Gains 0 0
Securities available for sale, Gross Unrealized Losses 0 0
Securities available for sale, at fair value 118 2,083
Total [Member]    
Securities available for sale:    
Securities available for sale, Amortized Cost 185,991 98,993
Securities available for sale, Gross Unrealized Gains 1,547 1,588
Securities available for sale, Gross Unrealized Losses 787 355
Securities available for sale, at fair value $ 186,751 $ 100,226