Note 3 - Loans and Allowance for Loan Losses (Details) - Impaired Loans - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Originated Loan [Member]
Financing Receivable, Impaired [Line Items]
Unpaid contractual principal, with no related allowance	$ 9,073,000		$ 9,259,000
Recorded principal, with no related allowance	8,198,000		8,364,000
Average recorded pricinpal, with no related allowance	8,282,000	$ 5,416,000
Unpaid contractual principal, with related allowance	14,582,000		14,870,000
Recorded principal, with related allowance	9,531,000		9,833,000
Related allowance	1,087,000		1,474,000
Average recorded pricinpal, with related allowance	9,683,000	41,238,000
Unpaid contractual principal, total	23,655,000		24,129,000
Recorded principal, total	17,729,000		18,197,000
Average recorded pricinpal, total	17,965,000	46,654,000
Acquired Loan [Member]
Financing Receivable, Impaired [Line Items]
Unpaid contractual principal, with no related allowance	6,522,000		7,368,000
Recorded principal, with no related allowance	5,704,000		6,588,000
Average recorded pricinpal, with no related allowance	6,146,000	3,856,000
Unpaid contractual principal, with related allowance	461,000		632,000
Recorded principal, with related allowance	449,000		625,000
Related allowance	107,000		112,000
Average recorded pricinpal, with related allowance	538,000	1,677,000
Unpaid contractual principal, total	6,983,000		8,000,000
Recorded principal, total	6,153,000		7,213,000
Average recorded pricinpal, total	6,684,000	5,533,000
Commercial Portfolio Segment [Member] | Originated Loan [Member]
Financing Receivable, Impaired [Line Items]
Unpaid contractual principal, with no related allowance	7,832,000		7,917,000
Recorded principal, with no related allowance	7,616,000		7,702,000
Average recorded pricinpal, with no related allowance	7,660,000	4,678,000
Unpaid contractual principal, with related allowance	13,906,000		14,105,000
Recorded principal, with related allowance	8,935,000		9,143,000
Related allowance	912,000		1,218,000
Average recorded pricinpal, with related allowance	9,040,000	39,962,000
Unpaid contractual principal, total	21,738,000		22,022,000
Recorded principal, total	16,551,000		16,845,000
Average recorded pricinpal, total	16,700,000	44,640,000
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Commercial and Industrial [Member]
Financing Receivable, Impaired [Line Items]
Unpaid contractual principal, with no related allowance	1,888,000		1,509,000
Recorded principal, with no related allowance	1,888,000		1,501,000
Average recorded pricinpal, with no related allowance	1,695,000	1,550,000
Unpaid contractual principal, with related allowance	284,000		352,000
Recorded principal, with related allowance	235,000		305,000
Related allowance	78,000		165,000
Average recorded pricinpal, with related allowance	270,000	5,196,000
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]
Financing Receivable, Impaired [Line Items]
Unpaid contractual principal, with no related allowance	0		0
Recorded principal, with no related allowance	0		0
Average recorded pricinpal, with no related allowance	0	203,000
Unpaid contractual principal, with related allowance	2,010,000		2,017,000
Recorded principal, with related allowance	1,640,000		1,655,000
Related allowance	73,000		245,000
Average recorded pricinpal, with related allowance	1,648,000	2,000,000
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Owner Occupied Loan [Member]
Financing Receivable, Impaired [Line Items]
Unpaid contractual principal, with no related allowance	285,000		712,000
Recorded principal, with no related allowance	69,000		505,000
Average recorded pricinpal, with no related allowance	287,000	1,950,000
Unpaid contractual principal, with related allowance	5,852,000		5,867,000
Recorded principal, with related allowance	1,300,000		1,314,000
Related allowance	238,000		242,000
Average recorded pricinpal, with related allowance	1,307,000	15,596,000
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Non Owner Occupied Loan [Member]
Financing Receivable, Impaired [Line Items]
Unpaid contractual principal, with no related allowance	5,659,000		5,696,000
Recorded principal, with no related allowance	5,659,000		5,696,000
Average recorded pricinpal, with no related allowance	5,678,000	662,000
Unpaid contractual principal, with related allowance	4,754,000		4,841,000
Recorded principal, with related allowance	4,754,000		4,841,000
Related allowance	188,000		201,000
Average recorded pricinpal, with related allowance	4,798,000	15,816,000
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Multi Family and Residential Rental Loan [Member]
Financing Receivable, Impaired [Line Items]
Unpaid contractual principal, with no related allowance	0		0
Recorded principal, with no related allowance	0		0
Average recorded pricinpal, with no related allowance	0	313,000
Unpaid contractual principal, with related allowance	1,006,000		1,028,000
Recorded principal, with related allowance	1,006,000		1,028,000
Related allowance	335,000		365,000
Average recorded pricinpal, with related allowance	1,017,000	1,354,000
Commercial Portfolio Segment [Member] | Acquired Loan [Member]
Financing Receivable, Impaired [Line Items]
Unpaid contractual principal, with no related allowance	4,519,000		5,093,000
Recorded principal, with no related allowance	4,153,000		4,730,000
Average recorded pricinpal, with no related allowance	4,442,000	2,458,000
Unpaid contractual principal, with related allowance	461,000		457,000
Recorded principal, with related allowance	449,000		450,000
Related allowance	107,000		106,000
Average recorded pricinpal, with related allowance	450,000	1,535,000
Unpaid contractual principal, total	4,980,000		5,550,000
Recorded principal, total	4,602,000		5,180,000
Average recorded pricinpal, total	4,892,000	3,993,000
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Commercial and Industrial [Member]
Financing Receivable, Impaired [Line Items]
Unpaid contractual principal, with no related allowance	1,456,000		1,528,000
Recorded principal, with no related allowance	1,430,000		1,494,000
Average recorded pricinpal, with no related allowance	1,462,000	1,267,000
Unpaid contractual principal, with related allowance	391,000		383,000
Recorded principal, with related allowance	379,000		376,000
Related allowance	102,000		102,000
Average recorded pricinpal, with related allowance	378,000	57,000
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]
Financing Receivable, Impaired [Line Items]
Unpaid contractual principal, with no related allowance	0		0
Recorded principal, with no related allowance	0		0
Average recorded pricinpal, with no related allowance	0	0
Unpaid contractual principal, with related allowance	0		0
Recorded principal, with related allowance	0		0
Related allowance	0		0
Average recorded pricinpal, with related allowance	0	0
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Owner Occupied Loan [Member]
Financing Receivable, Impaired [Line Items]
Unpaid contractual principal, with no related allowance	1,885,000		2,233,000
Recorded principal, with no related allowance	1,669,000		1,952,000
Average recorded pricinpal, with no related allowance	1,811,000	160,000
Unpaid contractual principal, with related allowance	50,000		51,000
Recorded principal, with related allowance	50,000		51,000
Related allowance	4,000		4,000
Average recorded pricinpal, with related allowance	50,000	1,464,000
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Non Owner Occupied Loan [Member]
Financing Receivable, Impaired [Line Items]
Unpaid contractual principal, with no related allowance	773,000		880,000
Recorded principal, with no related allowance	772,000		880,000
Average recorded pricinpal, with no related allowance	826,000	317,000
Unpaid contractual principal, with related allowance	0		0
Recorded principal, with related allowance	0		0
Related allowance	0		0
Average recorded pricinpal, with related allowance	0	0
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Multi Family and Residential Rental Loan [Member]
Financing Receivable, Impaired [Line Items]
Unpaid contractual principal, with no related allowance	405,000		452,000
Recorded principal, with no related allowance	282,000		404,000
Average recorded pricinpal, with no related allowance	343,000	714,000
Unpaid contractual principal, with related allowance	20,000		23,000
Recorded principal, with related allowance	20,000		23,000
Related allowance	1,000		0
Average recorded pricinpal, with related allowance	22,000	14,000
Retail Portfolio Segment [Member] | Originated Loan [Member]
Financing Receivable, Impaired [Line Items]
Unpaid contractual principal, with no related allowance	1,241,000		1,342,000
Recorded principal, with no related allowance	582,000		662,000
Average recorded pricinpal, with no related allowance	622,000	738,000
Unpaid contractual principal, with related allowance	676,000		765,000
Recorded principal, with related allowance	596,000		690,000
Related allowance	175,000		256,000
Average recorded pricinpal, with related allowance	643,000	1,276,000
Unpaid contractual principal, total	1,917,000		2,107,000
Recorded principal, total	1,178,000		1,352,000
Average recorded pricinpal, total	1,265,000	2,014,000
Retail Portfolio Segment [Member] | Originated Loan [Member] | Home Equity and Other [Member]
Financing Receivable, Impaired [Line Items]
Unpaid contractual principal, with no related allowance	19,000		14,000
Recorded principal, with no related allowance	9,000		5,000
Average recorded pricinpal, with no related allowance	7,000	191,000
Unpaid contractual principal, with related allowance	511,000		600,000
Recorded principal, with related allowance	470,000		562,000
Related allowance	140,000		209,000
Average recorded pricinpal, with related allowance	516,000	125,000
Retail Portfolio Segment [Member] | Originated Loan [Member] | 1-4 Family Mortgages [Member]
Financing Receivable, Impaired [Line Items]
Unpaid contractual principal, with no related allowance	1,222,000		1,328,000
Recorded principal, with no related allowance	573,000		657,000
Average recorded pricinpal, with no related allowance	615,000	547,000
Unpaid contractual principal, with related allowance	165,000		165,000
Recorded principal, with related allowance	126,000		128,000
Related allowance	35,000		47,000
Average recorded pricinpal, with related allowance	127,000	1,151,000
Retail Portfolio Segment [Member] | Acquired Loan [Member]
Financing Receivable, Impaired [Line Items]
Unpaid contractual principal, with no related allowance	2,003,000		2,275,000
Recorded principal, with no related allowance	1,551,000		1,858,000
Average recorded pricinpal, with no related allowance	1,704,000	1,398,000
Unpaid contractual principal, with related allowance	0		175,000
Recorded principal, with related allowance	0		175,000
Related allowance	0		6,000
Average recorded pricinpal, with related allowance	88,000	142,000
Unpaid contractual principal, total	2,003,000		2,450,000
Recorded principal, total	1,551,000		2,033,000
Average recorded pricinpal, total	1,792,000	1,540,000
Retail Portfolio Segment [Member] | Acquired Loan [Member] | Home Equity and Other [Member]
Financing Receivable, Impaired [Line Items]
Unpaid contractual principal, with no related allowance	394,000		471,000
Recorded principal, with no related allowance	277,000		310,000
Average recorded pricinpal, with no related allowance	293,000	504,000
Unpaid contractual principal, with related allowance	0		0
Recorded principal, with related allowance	0		0
Related allowance	0		0
Average recorded pricinpal, with related allowance	0	0
Retail Portfolio Segment [Member] | Acquired Loan [Member] | 1-4 Family Mortgages [Member]
Financing Receivable, Impaired [Line Items]
Unpaid contractual principal, with no related allowance	1,609,000		1,804,000
Recorded principal, with no related allowance	1,274,000		1,548,000
Average recorded pricinpal, with no related allowance	1,411,000	894,000
Unpaid contractual principal, with related allowance	0		175,000
Recorded principal, with related allowance	0		175,000
Related allowance	0		$ 6,000
Average recorded pricinpal, with related allowance	$ 88,000	$ 142,000