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Note 4 - Investment Securities (Details) - Amortized Cost and Fair Value of Debt Securities by Contractual Maturity - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Note 4 - Investment Securities (Details) - Amortized Cost and Fair Value of Debt Securities by Contractual Maturity [Line Items]    
Due in one year or less $ 2,521  
Due in one year or less 2,522  
Due in one year or less 0  
Due in one year or less 0  
Due after one year through five years 55,801  
Due after one year through five years 55,704  
Due after one year through five years 0  
Due after one year through five years 0  
Due after five years through ten years 45,938  
Due after five years through ten years 46,217  
Due after five years through ten years 0  
Due after five years through ten years 0  
Due after ten years 30,064  
Due after ten years 30,849  
Due after ten years 0  
Due after ten years 0  
134,324  
135,292  
0  
0  
Mortgage-backed securities and CMO 51,549  
Mortgage-backed securities and CMO 51,341  
Mortgage-backed securities and CMO 4  
Mortgage-backed securities and CMO 4  
4 $ 6
4 6
Debt Securities [Member]    
Note 4 - Investment Securities (Details) - Amortized Cost and Fair Value of Debt Securities by Contractual Maturity [Line Items]    
185,873 $ 96,910
186,633  
4  
$ 4