Note 3 - Loans and Allowance for Loan Losses - Activity for Troubled Debt Restructurings (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Commercial and Industrial [Member]
Beginning Balance	$ 2,103,000	$ 2,442,000	$ 2,028,000	$ 7,026,000
Charge-Offs	0	0	0	0
Payments	(230,000)	(56,000)	(175,000)	(6,591,000)
Transfers to ORE	0	0	0	0
Net Additions/Deletions	0	(302,000)	20,000	1,649,000
Ending Balance	1,873,000	2,084,000	1,873,000	2,084,000
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]
Beginning Balance	2,036,000	2,632,000	2,086,000	2,680,000
Charge-Offs	0	0	0	0
Payments	(526,000)	(272,000)	(576,000)	(320,000)
Transfers to ORE	0	0	0	0
Net Additions/Deletions	0	0	0	0
Ending Balance	1,510,000	2,360,000	1,510,000	2,360,000
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Owner Occupied Loan [Member]
Beginning Balance	1,431,000	2,218,000	1,400,000	17,160,000
Charge-Offs	0	0	0	(4,198,000)
Payments	(37,000)	(291,000)	(103,000)	(11,035,000)
Transfers to ORE	0	0	0	0
Net Additions/Deletions	0	0	97,000	0
Ending Balance	1,394,000	1,927,000	1,394,000	1,927,000
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Non Owner Occupied Loan [Member]
Beginning Balance	10,435,000	11,082,000	10,657,000	17,439,000
Charge-Offs	0	0	0	0
Payments	(91,000)	(324,000)	(313,000)	(6,681,000)
Transfers to ORE	0	0	0	0
Net Additions/Deletions	0	0	0	0
Ending Balance	10,344,000	10,758,000	10,344,000	10,758,000
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Multi Family and Residentia lRental Loan [Member]
Beginning Balance	461,000	491,000	476,000	505,000
Charge-Offs	0	0	0	0
Payments	(7,000)	(7,000)	(22,000)	(21,000)
Transfers to ORE	0	0	0	0
Net Additions/Deletions	0	0	0	0
Ending Balance	454,000	484,000	454,000	484,000
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Commercial and Industrial [Member]
Beginning Balance	1,644,000	1,521,000	1,686,000	1,439,000
Charge-Offs	0	0	(48,000)	0
Payments	(397,000)	(324,000)	(391,000)	(597,000)
Transfers to ORE	0	0	0	0
Net Additions/Deletions	0	0	0	355,000
Ending Balance	1,247,000	1,197,000	1,247,000	1,197,000
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]
Beginning Balance	0	0	0	0
Charge-Offs	0	0	0	0
Payments	0	0	0	0
Transfers to ORE	0	0	0	0
Net Additions/Deletions	0	0	0	0
Ending Balance	0	0	0	0
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Owner Occupied Loan [Member]
Beginning Balance	1,283,000	1,350,000	1,652,000	1,569,000
Charge-Offs	0	0	0	0
Payments	(747,000)	(77,000)	(1,116,000)	(296,000)
Transfers to ORE	0	0	0	0
Net Additions/Deletions	41,000	0	41,000	0
Ending Balance	577,000	1,273,000	577,000	1,273,000
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Non Owner Occupied Loan [Member]
Beginning Balance	681,000	361,000	647,000	64,000
Charge-Offs	0	0	0	0
Payments	(24,000)	(5,000)	(46,000)	(6,000)
Transfers to ORE	0	0	0	0
Net Additions/Deletions	0	236,000	56,000	534,000
Ending Balance	657,000	592,000	657,000	592,000
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Multi Family and Residentia lRental Loan [Member]
Beginning Balance	274,000	580,000	331,000	381,000
Charge-Offs	0	(42,000)	0	(42,000)
Payments	(35,000)	(274,000)	(99,000)	(329,000)
Transfers to ORE	0	0	0	0
Net Additions/Deletions	0	0	7,000	254,000
Ending Balance	239,000	264,000	239,000	264,000
Retail Portfolio Segment [Member] | Originated Loan [Member] | Home Equity and Other [Member]
Beginning Balance	329,000	0	146,000	0
Charge-Offs	0	0	0	0
Payments	(1,000)	0	(1,000)	0
Transfers to ORE	0	0	0	0
Net Additions/Deletions	59,000	0	242,000	0
Ending Balance	387,000	0	387,000	0
Retail Portfolio Segment [Member] | Originated Loan [Member] | One to Four Family Mortgages [Member]
Beginning Balance	163,000	270,000	128,000	1,967,000
Charge-Offs	0	0	0	(148,000)
Payments	(3,000)	(3,000)	(8,000)	(1,552,000)
Transfers to ORE	0	0	0	0
Net Additions/Deletions	0	0	40,000	0
Ending Balance	160,000	267,000	160,000	267,000
Retail Portfolio Segment [Member] | Acquired Loan [Member] | Home Equity and Other [Member]
Beginning Balance	180,000	152,000	141,000	26,000
Charge-Offs	0	0	0	0
Payments	(7,000)	(5,000)	(20,000)	(32,000)
Transfers to ORE	0	0	0	0
Net Additions/Deletions	3,000	0	55,000	153,000
Ending Balance	176,000	147,000	176,000	147,000
Retail Portfolio Segment [Member] | Acquired Loan [Member] | One to Four Family Mortgages [Member]
Beginning Balance	333,000	177,000	316,000	178,000
Charge-Offs	0	0	0	0
Payments	(4,000)	(1,000)	(6,000)	(2,000)
Transfers to ORE	0	0	0	0
Net Additions/Deletions	0	0	19,000	0
Ending Balance	$ 329,000	$ 176,000	$ 329,000	$ 176,000