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Note 8 - Deposits (Details) - Summary of Deposits - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Summary of Deposits [Abstract]    
Noninterest-bearing demand (in Dollars) $ 674,568,000 $ 558,738,000
Noninterest-bearing demand 29.60% 24.50%
Noninterest-bearing demand 20.70%  
Interest-bearing checking (in Dollars) $ 403,354,000 $ 413,382,000
Interest-bearing checking 17.70% 18.20%
Interest-bearing checking (2.40%)  
Money market (in Dollars) $ 274,395,000 $ 235,587,000
Money market 12.10% 10.30%
Money market 16.50%  
Savings (in Dollars) $ 332,794,000 $ 330,459,000
Savings 14.60% 14.50%
Savings 0.70%  
Time, under $100,000 (in Dollars) $ 155,655,000 $ 181,026,000
Time, under $100,000 6.90% 8.00%
Time, under $100,000 (14.00%)  
Time, $100,000 and over (in Dollars) $ 313,247,000 $ 382,120,000
Time, $100,000 and over 13.80% 16.80%
Time, $100,000 and over (18.00%)  
(in Dollars) $ 2,154,013,000 $ 2,101,312,000
94.70% 92.30%
2.50%  
Out-of-area time, under $100,000 (in Dollars) $ 149,000 $ 2,422,000
Out-of-area time, under $100,000 0.10% 0.10%
Out-of-area time, under $100,000 0.00%  
Out-of-area time, $100,000 and over (in Dollars) $ 121,220,000 $ 173,181,000
Out-of-area time, $100,000 and over 5.30% 7.60%
Out-of-area time, $100,000 and over (30.00%)  
(in Dollars) $ 121,369,000 $ 175,603,000
5.30% 7.70%
(30.90%)  
Total deposits (in Dollars) $ 2,275,382,000 $ 2,276,915,000
Total deposits 100.00% 100.00%
Total deposits (0.10%)