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Note 3 - Investment Securities (Details) - Investment Securities - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Securities available for sale:    
Securities available for sale, amortized cost $ 97,730 $ 98,993
Securities available for sale, gross unrealized gains 1,150 1,588
Securities available for sale, gross unrealized losses 519 355
Securities available for sale, fair value 98,361 100,226
Securities held to maturity:    
Securities held to maturity, amortized cost 5 6
Securities held to maturity, gross unrealized gains 0 0
Securities held to maturity, gross unrealized losses 0 0
Securities held to maturity, fair value 5 6
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Securities available for sale:    
Securities available for sale, amortized cost 34,387 32,135
Securities available for sale, gross unrealized gains 154 240
Securities available for sale, gross unrealized losses 203 79
Securities available for sale, fair value 34,338 32,296
Securities held to maturity:    
Securities held to maturity, amortized cost 5 6
Securities held to maturity, gross unrealized gains 0 0
Securities held to maturity, gross unrealized losses 0 0
Securities held to maturity, fair value 5 6
Agency Collateralized Mortgage Obligations [Member]    
Securities available for sale:    
Securities available for sale, amortized cost 11,478 14,461
Securities available for sale, gross unrealized gains 65 74
Securities available for sale, gross unrealized losses 81 150
Securities available for sale, fair value 11,462 14,385
US Government Agencies Debt Securities [Member]    
Securities available for sale:    
Securities available for sale, amortized cost 18,554 18,136
Securities available for sale, gross unrealized gains 35 32
Securities available for sale, gross unrealized losses 56 48
Securities available for sale, fair value 18,533 18,120
Municipal Notes [Member]    
Securities available for sale:    
Securities available for sale, amortized cost 31,834 32,178
Securities available for sale, gross unrealized gains 896 1,242
Securities available for sale, gross unrealized losses 179 78
Securities available for sale, fair value 32,551 33,342
Debt Securities [Member]    
Securities available for sale:    
Securities available for sale, amortized cost 96,253 96,910
Securities available for sale, gross unrealized gains 1,150 1,588
Securities available for sale, gross unrealized losses 519 355
Securities available for sale, fair value 96,884 98,143
Mutual Funds [Member]    
Securities available for sale:    
Securities available for sale, amortized cost 1,477 2,083
Securities available for sale, gross unrealized gains 0 0
Securities available for sale, gross unrealized losses 0 0
Securities available for sale, fair value $ 1,477 $ 2,083