Note 5 - Deposits (Details) - Summary of Deposits - USD ($)	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Summary of Deposits [Abstract]
Noninterest-bearing demand (in Dollars)	$ 678,100,000	$ 674,568,000
Noninterest-bearing demand	29.90%	29.60%
Noninterest-bearing demand	0.50%
Interest-bearing checking (in Dollars)	$ 372,519,000	$ 403,354,000
Interest-bearing checking	16.40%	17.70%
Interest-bearing checking	(7.60%)
Money market (in Dollars)	$ 309,906,000	$ 274,395,000
Money market	13.70%	12.10%
Money market	12.90%
Savings (in Dollars)	$ 339,089,000	$ 332,794,000
Savings	15.00%	14.60%
Savings	1.90%
Time, under $100,000 (in Dollars)	$ 152,008,000	$ 155,655,000
Time, under $100,000	6.70%	6.90%
Time, under $100,000	(2.30%)
Time, $100,000 and over (in Dollars)	$ 309,842,000	$ 313,247,000
Time, $100,000 and over	13.70%	13.80%
Time, $100,000 and over	(1.10%)
(in Dollars)	$ 2,161,464,000	$ 2,154,013,000
	95.40%	94.70%
	0.30%
Out-of-area time, under $100,000 (in Dollars)	$ 149,000	$ 149,000
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)	$ 103,509,000	$ 121,220,000
Out-of-area time, $100,000 and over	4.60%	5.30%
Out-of-area time, $100,000 and over	(14.60%)
(in Dollars)	$ 103,658,000	$ 121,369,000
	4.60%	5.30%
	(14.60%)
Total deposits (in Dollars)	$ 2,265,122,000	$ 2,275,382,000
Total deposits	100.00%	100.00%
Total deposits	(0.50%)