Note 7 - Securities Available for Sale (Details) - Securities in a Continuous Unrealized Loss Position $ in Thousands	Sep. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)
Mortgage backed securities:
Number of investments, less than twelve months	25	22
Fair value, less than twelve months	$ 8,135	$ 104,453
Unrealized losses, less than twelve months	$ (21)	$ (551)
Number of investments, twelve months or more	1	2
Fair value, twelve months or more	$ 350	$ 5,390
Unrealized losses, twelve months or more	(350)	(330)
Fair value	8,485	109,843
Unrealized losses	$ (371)	$ (881)
Federal National Mortgage Association Certificates and Obligations (FNMA) [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Mortgage backed securities:
Number of investments, less than twelve months	6
Fair value, less than twelve months	$ 51
Unrealized losses, less than twelve months	$ (1)
Number of investments, twelve months or more	0
Fair value, twelve months or more	$ 0
Unrealized losses, twelve months or more	0
Fair value	51
Unrealized losses	$ (1)
Federal National Mortgage Association Certificates and Obligations (FNMA) [Member] | Collateralized Mortgage Backed Securities [Member]
Mortgage backed securities:
Number of investments, less than twelve months	2
Fair value, less than twelve months	$ 522
Unrealized losses, less than twelve months	$ (2)
Number of investments, twelve months or more	0
Fair value, twelve months or more	$ 0
Unrealized losses, twelve months or more	0
Fair value	522
Unrealized losses	$ (2)
US Government Agencies Debt Securities [Member] | Other Marketable Securities [Member]
Mortgage backed securities:
Number of investments, less than twelve months	1	22
Fair value, less than twelve months	$ 5,005	$ 104,453
Unrealized losses, less than twelve months	$ (2)	$ (551)
Number of investments, twelve months or more	0	1
Fair value, twelve months or more	$ 0	$ 4,970
Unrealized losses, twelve months or more	0	(50)
Fair value	5,005	109,423
Unrealized losses	$ (2)	$ (601)
US States and Political Subdivisions Debt Securities [Member] | Other Marketable Securities [Member]
Mortgage backed securities:
Number of investments, less than twelve months	14
Fair value, less than twelve months	$ 2,168
Unrealized losses, less than twelve months	$ (6)
Number of investments, twelve months or more	0
Fair value, twelve months or more	$ 0
Unrealized losses, twelve months or more	0
Fair value	2,168
Unrealized losses	$ (6)
Corporate Debt Securities [Member] | Other Marketable Securities [Member]
Mortgage backed securities:
Number of investments, less than twelve months	1
Fair value, less than twelve months	$ 337
Unrealized losses, less than twelve months	$ (4)
Number of investments, twelve months or more	0
Fair value, twelve months or more	$ 0
Unrealized losses, twelve months or more	0
Fair value	337
Unrealized losses	$ (4)
Preferred Stock [Member] | Other Marketable Securities [Member]
Mortgage backed securities:
Number of investments, less than twelve months	0	0
Fair value, less than twelve months	$ 0	$ 0
Unrealized losses, less than twelve months	$ 0	$ 0
Number of investments, twelve months or more	1	1
Fair value, twelve months or more	$ 350	$ 420
Unrealized losses, twelve months or more	(350)	(280)
Fair value	350	420
Unrealized losses	$ (350)	$ (280)
Equity Securities [Member] | Other Marketable Securities [Member]
Mortgage backed securities:
Number of investments, less than twelve months	1
Fair value, less than twelve months	$ 52
Unrealized losses, less than twelve months	$ (6)
Number of investments, twelve months or more	0
Fair value, twelve months or more	$ 0
Unrealized losses, twelve months or more	0
Fair value	52
Unrealized losses	$ (6)