Note 18 - Parent Company Financial Information (Details) - Condensed Statement of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Note 18 - Parent Company Financial Information (Details) - Condensed Statement of Comprehensive Income [Line Items]
Net income									$ 11,642	$ 10,738
Net income									2,276	2,134
Net income	2,486	2,044	2,172	2,296	1,962	2,128	1,894	2,408	8,998	8,392
Net unrealized holding gains (losses) on securities:
Unrealized holding gains (losses) arising during the period									7,657	(11,098)
Unrealized holding gains (losses) arising during the period									2,604	(3,774)
Unrealized holding gains (losses) arising during the period									5,053	(7,324)
Reclassification adjustment for gains included in net income									(1,112)	(824)
Reclassification adjustment for gains included in net income									378	280
Reclassification adjustment for gains included in net income									(734)	(544)
Other comprehensive income (loss)									6,545	(11,922)
Other comprehensive income (loss)									(2,226)	4,054
Other comprehensive income (loss)									4,319	(7,868)
Total comprehensive income (loss)									18,187	(1,184)
Total comprehensive income (loss)									4,870	(1,708)
Parent Company [Member]
Note 18 - Parent Company Financial Information (Details) - Condensed Statement of Comprehensive Income [Line Items]
Net income									11,642	10,738
Net income									2,644	2,346
Net income									8,998	8,392
Net unrealized holding gains (losses) on securities:
Unrealized holding gains (losses) arising during the period									7,657	(11,098)
Unrealized holding gains (losses) arising during the period									2,604	(3,774)
Unrealized holding gains (losses) arising during the period									5,053	(7,324)
Reclassification adjustment for gains included in net income									(1,112)	(824)
Reclassification adjustment for gains included in net income									(378)	(280)
Reclassification adjustment for gains included in net income									(734)	(544)
Other comprehensive income (loss)									6,545	(11,922)
Other comprehensive income (loss)									2,226	(4,054)
Other comprehensive income (loss)									4,319	(7,868)
Total comprehensive income (loss)									18,187	(1,184)
Total comprehensive income (loss)									4,870	(1,708)
Total comprehensive income (loss)									$ 13,317	$ 524