Note 7 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position $ in Thousands	Sep. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)
Note 7 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position [Line Items]
No. of securities	132	165
Securities in an unrealized loss position less than 12 months, fair value	$ 69,294	$ 28,745
Securities in an unrealized loss position less than 12 months, unrealized losses	(965)	(351)
Securities in an unrealized loss position 12 months or longer, fair value	37,813	112,156
Securities in an unrealized loss position 12 months or longer, unrealized losses	(1,762)	(3,347)
Securities in an unrealized loss position, fair value	107,107	140,901
Securities in an unrealized loss position, unrealized losses	$ (2,727)	$ (3,698)
US Government Agencies Debt Securities [Member]
Note 7 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position [Line Items]
No. of securities	11	29
Securities in an unrealized loss position less than 12 months, fair value	$ 10,330	$ 15,466
Securities in an unrealized loss position less than 12 months, unrealized losses	(23)	(30)
Securities in an unrealized loss position 12 months or longer, fair value	4,477	23,941
Securities in an unrealized loss position 12 months or longer, unrealized losses	(21)	(442)
Securities in an unrealized loss position, fair value	14,807	39,407
Securities in an unrealized loss position, unrealized losses	$ (44)	$ (472)
US States and Political Subdivisions Debt Securities [Member]
Note 7 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position [Line Items]
No. of securities	37	39
Securities in an unrealized loss position less than 12 months, fair value	$ 11,973	$ 3,452
Securities in an unrealized loss position less than 12 months, unrealized losses	(58)	(31)
Securities in an unrealized loss position 12 months or longer, fair value	2,688	11,964
Securities in an unrealized loss position 12 months or longer, unrealized losses	(27)	(119)
Securities in an unrealized loss position, fair value	14,661	15,416
Securities in an unrealized loss position, unrealized losses	$ (85)	$ (150)
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Note 7 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position [Line Items]
No. of securities	24	34
Securities in an unrealized loss position less than 12 months, fair value	$ 34,497	$ 6,521
Securities in an unrealized loss position less than 12 months, unrealized losses	(171)	(15)
Securities in an unrealized loss position 12 months or longer, fair value	1,469	38,586
Securities in an unrealized loss position 12 months or longer, unrealized losses	(32)	(451)
Securities in an unrealized loss position, fair value	35,966	45,107
Securities in an unrealized loss position, unrealized losses	$ (203)	$ (466)
Collateralized Mortgage Obligations [Member]
Note 7 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position [Line Items]
No. of securities	30	51
Securities in an unrealized loss position less than 12 months, fair value	$ 5,259	$ 2,003
Securities in an unrealized loss position less than 12 months, unrealized losses	(19)	(205)
Securities in an unrealized loss position 12 months or longer, fair value	26,858	35,687
Securities in an unrealized loss position 12 months or longer, unrealized losses	(580)	(1,095)
Securities in an unrealized loss position, fair value	32,117	37,690
Securities in an unrealized loss position, unrealized losses	$ (599)	$ (1,300)
Collateralized Debt Obligations [Member]
Note 7 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position [Line Items]
No. of securities	5	5
Securities in an unrealized loss position 12 months or longer, fair value	$ 2,131	$ 1,978
Securities in an unrealized loss position 12 months or longer, unrealized losses	(1,024)	(1,240)
Securities in an unrealized loss position, fair value	2,131	1,978
Securities in an unrealized loss position, unrealized losses	$ (1,024)	$ (1,240)
Corporate Debt Securities [Member]
Note 7 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position [Line Items]
No. of securities	2
Securities in an unrealized loss position less than 12 months, fair value	$ 2,003
Securities in an unrealized loss position less than 12 months, unrealized losses	(11)
Securities in an unrealized loss position, fair value	2,003
Securities in an unrealized loss position, unrealized losses	$ (11)
Equity Securities [Member]
Note 7 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position [Line Items]
No. of securities	23	7
Securities in an unrealized loss position less than 12 months, fair value	$ 5,232	$ 1,303
Securities in an unrealized loss position less than 12 months, unrealized losses	(683)	(70)
Securities in an unrealized loss position 12 months or longer, fair value	190
Securities in an unrealized loss position 12 months or longer, unrealized losses	(78)
Securities in an unrealized loss position, fair value	5,422	1,303
Securities in an unrealized loss position, unrealized losses	$ (761)	$ (70)