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Note 3 - Investment Securities (Details) - Investment Securities - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Dec. 31, 2013
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, at fair value 98,361 100,226 $ 108,762
Securities held to maturity:      
Securities held to maturity, amortized cost 5 6 9
Securities held to maturity, gross unrealized gains 0 0 0
Securities held to maturity, gross unrealized losses 0 0 0
Securities held to maturity, at fair value 5 6 9
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]      
Securities available for sale:      
Securities available for sale, amortized cost 34,387 32,135 18,408
Securities available for sale, gross unrealized gains 154 240 205
Securities available for sale, gross unrealized losses 203 79 244
Securities available for sale, at fair value 34,338 32,296 18,369
Securities held to maturity:      
Securities held to maturity, amortized cost 5 6 9
Securities held to maturity, gross unrealized gains 0 0 0
Securities held to maturity, gross unrealized losses 0 0 0
Securities held to maturity, at fair value 5 6 9
Agency Collateralized Mortgage Obligations [Member]      
Securities available for sale:      
Securities available for sale, amortized cost 11,478 14,461 20,486
Securities available for sale, gross unrealized gains 65 74 96
Securities available for sale, gross unrealized losses 81 150 341
Securities available for sale, at fair value 11,462 14,385 20,241
US Government Agencies Debt Securities [Member]      
Securities available for sale:      
Securities available for sale, amortized cost 18,554 18,136 31,594
Securities available for sale, gross unrealized gains 35 32 49
Securities available for sale, gross unrealized losses 56 48 729
Securities available for sale, at fair value 18,533 18,120 30,914
Municipal Notes [Member]      
Securities available for sale:      
Securities available for sale, amortized cost 31,834 32,178 36,200
Securities available for sale, gross unrealized gains 896 1,242 778
Securities available for sale, gross unrealized losses 179 78 938
Securities available for sale, at fair value 32,551 33,342 36,040
Debt Securities [Member]      
Securities available for sale:      
Securities available for sale, amortized cost 96,253 96,910 106,688
Securities available for sale, gross unrealized gains 1,150 1,588 1,128
Securities available for sale, gross unrealized losses 519 355 2,252
Securities available for sale, at fair value 96,884 98,143 105,564
Securities held to maturity:      
Securities held to maturity, amortized cost   6  
Securities held to maturity, at fair value   6  
Mutual Funds [Member]      
Securities available for sale:      
Securities available for sale, amortized cost 1,477 2,083 3,238
Securities available for sale, gross unrealized gains 0 0 0
Securities available for sale, gross unrealized losses 0 0 40
Securities available for sale, at fair value $ 1,477 $ 2,083 $ 3,198