Note 3 - Loans and Allowance for Loan Losses - Loans Modified as Troubled Debt Restructurings (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Commercial and Industrial [Member]
Number of Contracts	0	0	1	9
Pre- Modification Recorded Principal Balance	$ 0	$ 0	$ 20,000	$ 1,876,000
Post- Modification Recorded Principal Balance	$ 0	$ 0	$ 20,000	$ 1,901,000
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]
Number of Contracts	0	0	0	0
Pre- Modification Recorded Principal Balance	$ 0	$ 0	$ 0	$ 0
Post- Modification Recorded Principal Balance	$ 0	$ 0	$ 0	$ 0
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Owner Occupied Loan [Member]
Number of Contracts	0	0	1	0
Pre- Modification Recorded Principal Balance	$ 0	$ 0	$ 167,000	$ 0
Post- Modification Recorded Principal Balance	$ 0	$ 0	$ 167,000	$ 0
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Non Owner Occupied Loan [Member]
Number of Contracts	0	0	0	0
Pre- Modification Recorded Principal Balance	$ 0	$ 0	$ 0	$ 0
Post- Modification Recorded Principal Balance	$ 0	$ 0	$ 0	$ 0
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Multi Family and Residentia lRental Loan [Member]
Number of Contracts	0	0	0	0
Pre- Modification Recorded Principal Balance	$ 0	$ 0	$ 0	$ 0
Post- Modification Recorded Principal Balance	$ 0	$ 0	$ 0	$ 0
Commercial Portfolio Segment [Member] | Originated Loan [Member]
Number of Contracts	0	0	2	9
Pre- Modification Recorded Principal Balance	$ 0	$ 0	$ 187,000	$ 1,876,000
Post- Modification Recorded Principal Balance	$ 0	$ 0	$ 187,000	$ 1,901,000
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Commercial and Industrial [Member]
Number of Contracts	0	0	0	2
Pre- Modification Recorded Principal Balance	$ 0	$ 0	$ 0	$ 286,000
Post- Modification Recorded Principal Balance	$ 0	$ 0	$ 0	$ 286,000
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]
Number of Contracts	0	0	0	0
Pre- Modification Recorded Principal Balance	$ 0	$ 0	$ 0	$ 0
Post- Modification Recorded Principal Balance	$ 0	$ 0	$ 0	$ 0
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Owner Occupied Loan [Member]
Number of Contracts	1	0	1	3
Pre- Modification Recorded Principal Balance	$ 44,000	$ 0	$ 44,000	$ 66,000
Post- Modification Recorded Principal Balance	$ 44,000	$ 0	$ 44,000	$ 66,000
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Non Owner Occupied Loan [Member]
Number of Contracts	0	1	1	4
Pre- Modification Recorded Principal Balance	$ 0	$ 237,000	$ 60,000	$ 655,000
Post- Modification Recorded Principal Balance	$ 0	$ 237,000	$ 60,000	$ 655,000
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Multi Family and Residentia lRental Loan [Member]
Number of Contracts	0	0	1	2
Pre- Modification Recorded Principal Balance	$ 0	$ 0	$ 7,000	$ 202,000
Post- Modification Recorded Principal Balance	$ 0	$ 0	$ 7,000	$ 202,000
Commercial Portfolio Segment [Member] | Acquired Loan [Member]
Number of Contracts	1	1	3	11
Pre- Modification Recorded Principal Balance	$ 44,000	$ 237,000	$ 111,000	$ 1,209,000
Post- Modification Recorded Principal Balance	$ 44,000	$ 237,000	$ 111,000	$ 1,209,000
Retail Portfolio Segment [Member] | Originated Loan [Member] | Home Equity and Other [Member]
Number of Contracts	1	0	3	0
Pre- Modification Recorded Principal Balance	$ 56,000	$ 0	$ 240,000	$ 0
Post- Modification Recorded Principal Balance	$ 56,000	$ 0	$ 240,000	$ 0
Retail Portfolio Segment [Member] | Originated Loan [Member] | One to Four Family Mortgages [Member]
Number of Contracts	0	0	1	0
Pre- Modification Recorded Principal Balance	$ 0	$ 0	$ 33,000	$ 0
Post- Modification Recorded Principal Balance	$ 0	$ 0	$ 40,000	$ 0
Retail Portfolio Segment [Member] | Originated Loan [Member]
Number of Contracts	1	0	4	0
Pre- Modification Recorded Principal Balance	$ 56,000	$ 0	$ 273,000	$ 0
Post- Modification Recorded Principal Balance	$ 56,000	$ 0	$ 280,000	$ 0
Retail Portfolio Segment [Member] | Acquired Loan [Member] | Home Equity and Other [Member]
Number of Contracts	1	0	3	0
Pre- Modification Recorded Principal Balance	$ 3,000	$ 0	$ 54,000	$ 0
Post- Modification Recorded Principal Balance	$ 3,000	$ 0	$ 54,000	$ 0
Retail Portfolio Segment [Member] | Acquired Loan [Member] | One to Four Family Mortgages [Member]
Number of Contracts	0	0	1
Pre- Modification Recorded Principal Balance	$ 0	$ 0	$ 19,000
Post- Modification Recorded Principal Balance	$ 0	$ 0	$ 19,000
Retail Portfolio Segment [Member] | Acquired Loan [Member]
Number of Contracts	1	0	4	0
Pre- Modification Recorded Principal Balance	$ 3,000	$ 0	$ 73,000	$ 0
Post- Modification Recorded Principal Balance	$ 3,000	$ 0	$ 73,000	$ 0
Originated Loan [Member]
Number of Contracts	1	0	6	9
Pre- Modification Recorded Principal Balance	$ 56,000	$ 0	$ 460,000	$ 1,876,000
Post- Modification Recorded Principal Balance	$ 56,000	$ 0	$ 467,000	$ 1,901,000
Acquired Loan [Member]
Number of Contracts	2	1	7	11
Pre- Modification Recorded Principal Balance	$ 47,000	$ 237,000	$ 184,000	$ 1,209,000
Post- Modification Recorded Principal Balance	$ 47,000	$ 237,000	$ 184,000	$ 1,209,000