Note 2 - Securities- Securities in a Continuous Loss Position (Details) - USD ($)	Jun. 30, 2016	Dec. 31, 2015
US Government Agencies Debt Securities [Member]
Available for Sale Securities in a Continuous Loss Position, Less than 12 months Fair Value	$ 3,991,000	$ 0
Available for Sale Securities in a Continuous Loss Position, Less than 12 months Unrealized Loss	9,000	0
Available for Sale Securities in a Continuous Loss Position, 12 Months or More Fair Value	2,958,000	76,496,000
Available for Sale Securities in a Continuous Loss Position, 12 Months or More Unrealized Loss	29,000	1,552,000
Available for Sale Securities in a Continuous Loss Position, Fair Value	6,949,000	76,496,000
Available for Sale Securities in a Continuous Loss Position, Unrealized Loss	38,000	1,552,000
Collateralized Mortgage Backed Securities [Member]
Available for Sale Securities in a Continuous Loss Position, Less than 12 months Fair Value	3,212,000	18,025,000
Available for Sale Securities in a Continuous Loss Position, Less than 12 months Unrealized Loss	16,000	69,000
Available for Sale Securities in a Continuous Loss Position, 12 Months or More Fair Value	9,899,000	34,660,000
Available for Sale Securities in a Continuous Loss Position, 12 Months or More Unrealized Loss	34,000	235,000
Available for Sale Securities in a Continuous Loss Position, Fair Value	13,111,000	52,685,000
Available for Sale Securities in a Continuous Loss Position, Unrealized Loss	50,000	304,000
Municipal General Obligation Bonds [Member]
Available for Sale Securities in a Continuous Loss Position, Less than 12 months Fair Value	850,000	1,981,000
Available for Sale Securities in a Continuous Loss Position, Less than 12 months Unrealized Loss	5,000	4,000
Available for Sale Securities in a Continuous Loss Position, 12 Months or More Fair Value	9,042,000	30,134,000
Available for Sale Securities in a Continuous Loss Position, 12 Months or More Unrealized Loss	89,000	201,000
Available for Sale Securities in a Continuous Loss Position, Fair Value	9,892,000	32,115,000
Available for Sale Securities in a Continuous Loss Position, Unrealized Loss	94,000	205,000
Municipal Revenue Bonds [Member]
Available for Sale Securities in a Continuous Loss Position, Less than 12 months Fair Value	557,000	0
Available for Sale Securities in a Continuous Loss Position, Less than 12 months Unrealized Loss	0	0
Available for Sale Securities in a Continuous Loss Position, 12 Months or More Fair Value	0	1,134,000
Available for Sale Securities in a Continuous Loss Position, 12 Months or More Unrealized Loss	0	3,000
Available for Sale Securities in a Continuous Loss Position, Fair Value	557,000	1,134,000
Available for Sale Securities in a Continuous Loss Position, Unrealized Loss	0	3,000
Other Debt Obligations [Member]
Available for Sale Securities in a Continuous Loss Position, Less than 12 months Fair Value	0	1,446,000
Available for Sale Securities in a Continuous Loss Position, Less than 12 months Unrealized Loss	0	5,000
Available for Sale Securities in a Continuous Loss Position, 12 Months or More Fair Value	0	0
Available for Sale Securities in a Continuous Loss Position, 12 Months or More Unrealized Loss	0	0
Available for Sale Securities in a Continuous Loss Position, Fair Value	0	1,446,000
Available for Sale Securities in a Continuous Loss Position, Unrealized Loss	0	5,000
Available for Sale Securities in a Continuous Loss Position, Less than 12 months Fair Value	8,610,000	21,452,000
Available for Sale Securities in a Continuous Loss Position, Less than 12 months Unrealized Loss	30,000	78,000
Available for Sale Securities in a Continuous Loss Position, 12 Months or More Fair Value	21,899,000	142,424,000
Available for Sale Securities in a Continuous Loss Position, 12 Months or More Unrealized Loss	152,000	1,991,000
Available for Sale Securities in a Continuous Loss Position, Fair Value	30,509,000	163,876,000
Available for Sale Securities in a Continuous Loss Position, Unrealized Loss	$ 182,000	$ 2,069,000