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Note 3 - Investment Securities (Details) - Investment Securities Available for Sale
$ in Thousands
Jun. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
Continuous loss position less than twelve months:    
Number of Investment Positions 48 20
Fair Value $ 32,157 $ 10,731
Gross Unrealized Losses $ 298 $ 51
Continuous loss position more than twelve months:    
Number of Investment Positions 19 31
Fair Value $ 14,325 $ 25,024
Gross Unrealized Losses $ 221 $ 304
Total securities available for sale 67 51
Total securities available for sale $ 46,482 $ 35,755
Total securities available for sale $ 519 $ 355
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Continuous loss position less than twelve months:    
Number of Investment Positions 22 7
Fair Value $ 17,893 $ 5,925
Gross Unrealized Losses $ 150 $ 21
Continuous loss position more than twelve months:    
Number of Investment Positions 4 6
Fair Value $ 4,426 $ 5,986
Gross Unrealized Losses $ 53 $ 58
Agency Collateralized Mortgage Obligations [Member]    
Continuous loss position less than twelve months:    
Number of Investment Positions   2
Fair Value   $ 1,317
Gross Unrealized Losses   $ 21
Continuous loss position more than twelve months:    
Number of Investment Positions 9 9
Fair Value $ 6,594 $ 7,306
Gross Unrealized Losses $ 81 $ 129
US Government Agencies Debt Securities [Member]    
Continuous loss position less than twelve months:    
Number of Investment Positions 9 2
Fair Value $ 7,696 $ 1,198
Gross Unrealized Losses $ 53 $ 2
Continuous loss position more than twelve months:    
Number of Investment Positions 1 7
Fair Value $ 999 $ 7,586
Gross Unrealized Losses $ 3 $ 47
Municipal Notes [Member]    
Continuous loss position less than twelve months:    
Number of Investment Positions 17 9
Fair Value $ 6,568 $ 2,291
Gross Unrealized Losses $ 95 $ 8
Continuous loss position more than twelve months:    
Number of Investment Positions 5 9
Fair Value $ 2,306 $ 4,146
Gross Unrealized Losses $ 84 $ 70