Note 3 - Loans and Allowance for Loan Losses - Activity for Troubled Debt Restructurings (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Commercial and Industrial [Member]
Beginning Balance	$ 1,946,000	$ 6,556,000	$ 2,028,000	$ 7,026,000
Charge-Offs	0	0	0	0
Payments	0	(5,380,000)	(101,000)	(6,535,000)
Transfers to ORE	0	0	0	0
Net Additions/Deletions	157,000	1,266,000	176,000	1,951,000
Ending Balance	2,103,000	2,442,000	2,103,000	2,442,000
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]
Beginning Balance	2,062,000	2,654,000	2,086,000	2,680,000
Charge-Offs	0	0	0	0
Payments	(26,000)	(22,000)	(50,000)	(48,000)
Transfers to ORE	0	0	0	0
Net Additions/Deletions	0	0	0	0
Ending Balance	2,036,000	2,632,000	2,036,000	2,632,000
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Owner Occupied Loan [Member]
Beginning Balance	1,369,000	16,966,000	1,400,000	17,160,000
Charge-Offs	0	(4,198,000)	0	(4,198,000)
Payments	(35,000)	(10,550,000)	(66,000)	(10,744,000)
Transfers to ORE	0	0	0	0
Net Additions/Deletions	97,000	0	97,000	0
Ending Balance	1,431,000	2,218,000	1,431,000	2,218,000
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Non Owner Occupied Loan [Member]
Beginning Balance	10,529,000	16,063,000	10,657,000	17,439,000
Charge-Offs	0	0	0	0
Payments	(94,000)	(4,981,000)	(222,000)	(6,357,000)
Transfers to ORE	0	0	0	0
Net Additions/Deletions	0	0	0	0
Ending Balance	10,435,000	11,082,000	10,435,000	11,082,000
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Multi Family and Residentia lRental Loan [Member]
Beginning Balance	469,000	498,000	476,000	505,000
Charge-Offs	0	0	0	0
Payments	(8,000)	(7,000)	(15,000)	(14,000)
Transfers to ORE	0	0	0	0
Net Additions/Deletions	0	0	0	0
Ending Balance	461,000	491,000	461,000	491,000
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Commercial and Industrial [Member]
Beginning Balance	1,687,000	1,519,000	1,686,000	1,439,000
Charge-Offs	0	0	(48,000)	0
Payments	(43,000)	(275,000)	(43,000)	(275,000)
Transfers to ORE	0	0	0	0
Net Additions/Deletions	0	277,000	49,000	357,000
Ending Balance	1,644,000	1,521,000	1,644,000	1,521,000
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	1,455,000	1,492,000	1,652,000	1,569,000
Charge-Offs	0	(31,000)	0	(31,000)
Payments	(172,000)	(292,000)	(369,000)	(471,000)
Transfers to ORE	0	0	0	0
Net Additions/Deletions	0	181,000	0	283,000
Ending Balance	1,283,000	1,350,000	1,283,000	1,350,000
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Non Owner Occupied Loan [Member]
Beginning Balance	637,000	62,000	647,000	64,000
Charge-Offs	0	0	0	0
Payments	(12,000)	0	(22,000)	(2,000)
Transfers to ORE	0	0	0	0
Net Additions/Deletions	56,000	299,000	56,000	299,000
Ending Balance	681,000	361,000	681,000	361,000
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Multi Family and Residentia lRental Loan [Member]
Beginning Balance	278,000	333,000	331,000	381,000
Charge-Offs	0	0	0	0
Payments	(11,000)	(6,000)	(64,000)	(54,000)
Transfers to ORE	0	0	0	0
Net Additions/Deletions	7,000	253,000	7,000	253,000
Ending Balance	274,000	580,000	274,000	580,000
Retail Portfolio Segment [Member] | Originated Loan [Member] | Home Equity and Other [Member]
Beginning Balance	146,000	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	184,000	0	184,000	0
Ending Balance	329,000	0	329,000	0
Retail Portfolio Segment [Member] | Originated Loan [Member] | One to Four Family Mortgages [Member]
Beginning Balance	126,000	302,000	128,000	1,967,000
Charge-Offs	0	(23,000)	0	(148,000)
Payments	(3,000)	(9,000)	(5,000)	(1,549,000)
Transfers to ORE	0	0	0	0
Net Additions/Deletions	40,000	0	40,000	0
Ending Balance	163,000	270,000	163,000	270,000
Retail Portfolio Segment [Member] | Acquired Loan [Member] | Home Equity and Other [Member]
Beginning Balance	161,000	0	141,000	26,000
Charge-Offs	0	0	0	0
Payments	(7,000)	0	(14,000)	(26,000)
Transfers to ORE	0	0	0	0
Net Additions/Deletions	26,000	152,000	53,000	152,000
Ending Balance	180,000	152,000	180,000	152,000
Retail Portfolio Segment [Member] | Acquired Loan [Member] | One to Four Family Mortgages [Member]
Beginning Balance	335,000	177,000	316,000	178,000
Charge-Offs	0	0	0	0
Payments	(2,000)	0	(3,000)	(1,000)
Transfers to ORE	0	0	0	0
Net Additions/Deletions	0	0	20,000	0
Ending Balance	$ 333,000	$ 177,000	$ 333,000	$ 177,000