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Note 3 - Investment Securities (Details) - Investment Securities - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Securities available for sale:    
Securities available for sale, amortized cost $ 94,017 $ 98,993
Securities available for sale, gross unrealized gains 1,379 1,588
Securities available for sale, gross unrealized losses 186 355
Securities available for sale, fair value 95,210 100,226
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 34,495 32,135
Securities available for sale, gross unrealized gains 281 240
Securities available for sale, gross unrealized losses 48 79
Securities available for sale, fair value 34,728 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 10,341 14,461
Securities available for sale, gross unrealized gains 61 74
Securities available for sale, gross unrealized losses 57 150
Securities available for sale, fair value 10,345 14,385
US Government Agencies Debt Securities [Member]    
Securities available for sale:    
Securities available for sale, amortized cost 16,751 18,136
Securities available for sale, gross unrealized gains 43 32
Securities available for sale, gross unrealized losses 2 48
Securities available for sale, fair value 16,792 18,120
Municipal Notes [Member]    
Securities available for sale:    
Securities available for sale, amortized cost 31,825 32,178
Securities available for sale, gross unrealized gains 994 1,242
Securities available for sale, gross unrealized losses 79 78
Securities available for sale, fair value 32,740 33,342
Debt Securities [Member]    
Securities available for sale:    
Securities available for sale, amortized cost 93,412 96,910
Securities available for sale, gross unrealized gains 1,379 1,588
Securities available for sale, gross unrealized losses 186 355
Securities available for sale, fair value 94,605 98,143
Mutual Funds [Member]    
Securities available for sale:    
Securities available for sale, amortized cost 605 2,083
Securities available for sale, gross unrealized gains 0 0
Securities available for sale, gross unrealized losses   0
Securities available for sale, fair value $ 605 $ 2,083