Note 4 - Loans and Allowance for Loan Losses - Activity for Troubled Debt Restructurings (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Commercial and Industrial [Member]
Beginning Balance	$ 2,028,000	$ 7,026,000	$ 1,656,000
Charge-Offs	0	0	(67,000)
Payments	(555,000)	(6,648,000)	(871,000)
Transfers to ORE	0	0	(21,000)
Net Additions/Deletions	30,000	1,650,000	6,329,000
Ending Balance	1,503,000	2,028,000	7,026,000
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]
Beginning Balance	2,086,000	2,680,000	4,501,000
Charge-Offs	0	0	0
Payments	(598,000)	(594,000)	(4,719,000)
Transfers to ORE	0	0	0
Net Additions/Deletions	0	0	2,898,000
Ending Balance	1,488,000	2,086,000	2,680,000
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Owner Occupied Loan [Member]
Beginning Balance	1,400,000	17,160,000	1,816,000
Charge-Offs	0	(4,198,000)	(11,000)
Payments	(591,000)	(11,562,000)	(2,343,000)
Transfers to ORE	0	0	(48,000)
Net Additions/Deletions	97,000	0	17,746,000
Ending Balance	906,000	1,400,000	17,160,000
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Non Owner Occupied Loan [Member]
Beginning Balance	10,657,000	17,439,000	22,312,000
Charge-Offs	0	0	0
Payments	(6,004,000)	(6,782,000)	(5,191,000)
Transfers to ORE	0	0	0
Net Additions/Deletions	457,000	0	318,000
Ending Balance	5,110,000	10,657,000	17,439,000
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Multi Family and Residentia lRental Loan [Member]
Beginning Balance	476,000	505,000	2,620,000
Charge-Offs	0	0	(420,000)
Payments	(30,000)	(29,000)	(1,695,000)
Transfers to ORE	0	0	0
Net Additions/Deletions	270,000	0	0
Ending Balance	716,000	476,000	505,000
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Commercial and Industrial [Member]
Beginning Balance	1,686,000	1,439,000	0
Charge-Offs	(48,000)	0	0
Payments	(513,000)	(444,000)	(2,000)
Transfers to ORE	0	0	0
Net Additions/Deletions	0	691,000	1,441,000
Ending Balance	1,125,000	1,686,000	1,439,000
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]
Beginning Balance	0	0	0
Charge-Offs	0	0	0
Payments	0	0	0
Transfers to ORE	0	0	0
Net Additions/Deletions	0	0	0
Ending Balance	0	0	0
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Owner Occupied Loan [Member]
Beginning Balance	1,652,000	1,569,000	0
Charge-Offs	0	(31,000)	0
Payments	(1,514,000)	(590,000)	0
Transfers to ORE	0	0	0
Net Additions/Deletions	762,000	704,000	1,569,000
Ending Balance	900,000	1,652,000	1,569,000
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Non Owner Occupied Loan [Member]
Beginning Balance	647,000	64,000	0
Charge-Offs	0	0	0
Payments	(110,000)	(9,000)	0
Transfers to ORE	0	0	0
Net Additions/Deletions	191,000	592,000	64,000
Ending Balance	728,000	647,000	64,000
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Multi Family and Residentia lRental Loan [Member]
Beginning Balance	331,000	381,000	0
Charge-Offs	0	(42,000)	0
Payments	(278,000)	(342,000)	(18,000)
Transfers to ORE	0	0	0
Net Additions/Deletions	7,000	334,000	399,000
Ending Balance	60,000	331,000	381,000
Retail Portfolio Segment [Member] | Originated Loan [Member] | Home Equity and Other [Member]
Beginning Balance	146,000	0	0
Charge-Offs	0	0	0
Payments	(1,000)	0	0
Transfers to ORE	0	0	0
Net Additions/Deletions	240,000	146,000	0
Ending Balance	385,000	146,000	0
Retail Portfolio Segment [Member] | Originated Loan [Member] | One to Four Family Mortgages [Member]
Beginning Balance	128,000	1,967,000	1,987,000
Charge-Offs	0	(148,000)	0
Payments	(11,000)	(1,691,000)	(224,000)
Transfers to ORE	0	0	0
Net Additions/Deletions	40,000	0	204,000
Ending Balance	157,000	128,000	1,967,000
Retail Portfolio Segment [Member] | Acquired Loan [Member] | Home Equity and Other [Member]
Beginning Balance	141,000	26,000	0
Charge-Offs	0	0	0
Payments	(30,000)	(39,000)	0
Transfers to ORE	0	0	0
Net Additions/Deletions	97,000	154,000	26,000
Ending Balance	208,000	141,000	26,000
Retail Portfolio Segment [Member] | Acquired Loan [Member] | One to Four Family Mortgages [Member]
Beginning Balance	316,000	178,000	0
Charge-Offs	0	0	0
Payments	(9,000)	(3,000)	0
Transfers to ORE	0	0	0
Net Additions/Deletions	19,000	141,000	178,000
Ending Balance	$ 326,000	$ 316,000	$ 178,000