Note 4 - Loans and Allowance for Loan Losses - Activity In the Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Balance at beginning of period				$ 10,315				$ 13,968	$ 10,315	$ 13,968	$ 20,577
Provision for loan losses	$ 175	$ (190)	$ (156)	(473)	$ (722)	$ (898)	$ (264)	(1,545)	(644)	(3,429)	(4,364)
Recoveries									413	785	1,507
Loans charged off									(740)	(1,009)	(3,752)
Balance at end of period	9,344				10,315				9,344	10,315	13,968
Real Estate Portfolio Segment [Member]
Balance at beginning of period				9,173				12,542	9,173	12,542	18,716
Provision for loan losses									(702)	(3,099)	(4,922)
Recoveries									141	463	624
Loans charged off									(407)	(733)	(1,876)
Balance at end of period	8,205				9,173				8,205	9,173	12,542
Commercial Portfolio Segment [Member]
Balance at beginning of period				820				1,153	820	1,153	1,409
Provision for loan losses									50	(449)	620
Recoveries									203	210	786
Loans charged off									(219)	(94)	(1,662)
Balance at end of period	854				820				854	820	1,153
Consumer Portfolio Segment [Member]
Balance at beginning of period				$ 322				$ 273	322	273	452
Provision for loan losses									8	119	(62)
Recoveries									69	112	97
Loans charged off									(114)	(182)	(214)
Balance at end of period	$ 285				$ 322				$ 285	$ 322	$ 273