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Note 3 - Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Details) - USD ($)
Jun. 30, 2016
Dec. 31, 2015
Debt Securities [Member]    
$ 242,304,000  
245,544,000  
Amortized Cost 3,000  
Fair Value 3,000  
Due in one year or less 2,939,000  
Due in one year or less 2,949,000  
Due in one year or less 0  
Due in one year or less 0  
Due after one year through five years 87,145,000  
Due after one year through five years 87,476,000  
Due after one year through five years 0  
Due after one year through five years 0  
Due after five years through ten years 17,626,000  
Due after five years through ten years 18,072,000  
Due after five years through ten years  
Due after five years through ten years  
Due after ten years 31,446,000  
Due after ten years 33,174,000  
Due after ten years 0  
Due after ten years 0  
139,156,000  
141,671,000  
0  
0  
Mortgage-backed securities and CMO 103,148,000  
Mortgage-backed securities and CMO 103,873,000  
Mortgage-backed securities and CMO 3,000  
Mortgage-backed securities and CMO 3,000  
Amortized Cost 3,000 $ 4,000
Fair Value $ 3,000 $ 4,000