Note 7 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Note 7 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position [Line Items]
No. of securities	112	165
Securities in an unrealized loss position less than 12 months, fair value	$ 53,699	$ 28,745
Securities in an unrealized loss position less than 12 months, unrealized losses	(419)	(351)
Securities in an unrealized loss position 12 months or longer, fair value	48,833	112,156
Securities in an unrealized loss position 12 months or longer, unrealized losses	(1,958)	(3,347)
Securities in an unrealized loss position, fair value	102,532	140,901
Securities in an unrealized loss position, unrealized losses	(2,377)	(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	4,463	15,466
Securities in an unrealized loss position less than 12 months, unrealized losses	(21)	(30)
Securities in an unrealized loss position 12 months or longer, fair value	9,654	23,941
Securities in an unrealized loss position 12 months or longer, unrealized losses	(92)	(442)
Securities in an unrealized loss position, fair value	14,117	39,407
Securities in an unrealized loss position, unrealized losses	(113)	(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	28	39
Securities in an unrealized loss position less than 12 months, fair value	6,818	3,452
Securities in an unrealized loss position less than 12 months, unrealized losses	(28)	(31)
Securities in an unrealized loss position 12 months or longer, fair value	3,978	11,964
Securities in an unrealized loss position 12 months or longer, unrealized losses	(40)	(119)
Securities in an unrealized loss position, fair value	10,796	15,416
Securities in an unrealized loss position, unrealized losses	(68)	(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	23	34
Securities in an unrealized loss position less than 12 months, fair value	28,768	6,521
Securities in an unrealized loss position less than 12 months, unrealized losses	(159)	(15)
Securities in an unrealized loss position 12 months or longer, fair value	2,626	38,586
Securities in an unrealized loss position 12 months or longer, unrealized losses	(41)	(451)
Securities in an unrealized loss position, fair value	31,394	45,107
Securities in an unrealized loss position, unrealized losses	(200)	(466)
Collateralized Mortgage Obligations [Member]
Note 7 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position [Line Items]
No. of securities	34	51
Securities in an unrealized loss position less than 12 months, fair value	11,346	2,003
Securities in an unrealized loss position less than 12 months, unrealized losses	(41)	(205)
Securities in an unrealized loss position 12 months or longer, fair value	30,494	35,687
Securities in an unrealized loss position 12 months or longer, unrealized losses	(648)	(1,095)
Securities in an unrealized loss position, fair value	41,840	37,690
Securities in an unrealized loss position, unrealized losses	(689)	(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	2,081	1,978
Securities in an unrealized loss position 12 months or longer, unrealized losses	(1,137)	(1,240)
Securities in an unrealized loss position, fair value	2,081	1,978
Securities in an unrealized loss position, unrealized losses	(1,137)	(1,240)
Equity Securities [Member]
Note 7 - Investment Securities (Details) - Securities in a Continuous Unrealized Loss Position [Line Items]
No. of securities	11	7
Securities in an unrealized loss position less than 12 months, fair value	2,304	1,303
Securities in an unrealized loss position less than 12 months, unrealized losses	(170)	(70)
Securities in an unrealized loss position, fair value	2,304	1,303
Securities in an unrealized loss position, unrealized losses	$ (170)	$ (70)