Note 18 - Parent Company Financial Information (Details) - Statements of Cash Flows (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net income (loss)	$ 2,442,000	$ (3,480,000)	$ 3,614,000
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Share based compensation	420,000	325,000	370,000
Cash flows from financing activities:
Net proceeds from stock offering	44,853,000
Exercise of stock options	975
Increase (decrease) in cash	92,946,000	(92,124,000)	(102,951,000)
Cash, beginning of period	35,880,000
Cash, end of period	128,826,000	35,880,000
Parent Company [Member]
Cash flows from operating activities:
Net income (loss)	2,442,000	(3,480,000)	3,614,000
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Share based compensation	420,000	325,000	370,000
Increase in other assets	(526,000)	(506,000)	(542,000)
Decrease in other liabilities		(809,000)	(226,000)
Equity in undistributed (income) losses of subsidiaries	(3,416,000)	4,431,000	(4,535,000)
Net cash used in operating activities	(1,080,000)	(39,000)	(1,319,000)
Cash flows from investing activities:
Investment in subsidiary	(35,000,000)
Net cash used in investing activities	(35,000,000)
Cash flows from financing activities:
Net proceeds from stock offering	44,853,000
Exercise of stock options	1,000
Net cash provided by financing activities	44,854,000
Increase (decrease) in cash	8,774,000	(39,000)	(1,319,000)
Cash, beginning of period	697,000	736,000	2,055,000
Cash, end of period	$ 9,471,000	$ 697,000	$ 736,000