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Note 5 - Loans and Allowance for Loan Losses - Loans Restructured as TDRs, Excluding Loans Acquired, Segregated by Class of Loans (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Number of Loans	16	70
Balance Prior to TDR	$ 11,001	$ 13,907
Balance	10,905	13,757
Financial Impact on Date of Restructure	33
Extended Maturity [Member]
Balance	10,866	12,071
Contractual Interest Rate Reduction [Member]
Balance	$ 39	$ 1,686
Commercial Real Estate Portfolio Segment [Member]
Number of Loans	5	51
Balance Prior to TDR	$ 8,310	$ 11,861
Balance	8,301	11,778
Financial Impact on Date of Restructure	33
Commercial Real Estate Portfolio Segment [Member] | Extended Maturity [Member]
Balance	8,301	10,092
Commercial Real Estate Portfolio Segment [Member] | Contractual Interest Rate Reduction [Member]
Balance		$ 1,686
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Number of Loans	1
Balance Prior to TDR	$ 456
Balance	456
Financial Impact on Date of Restructure
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Extended Maturity [Member]
Balance	456
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Contractual Interest Rate Reduction [Member]
Balance
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member]
Number of Loans	1	23
Balance Prior to TDR	$ 139	$ 1,570
Balance	130	1,518
Financial Impact on Date of Restructure
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member] | Extended Maturity [Member]
Balance	130	964
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member] | Contractual Interest Rate Reduction [Member]
Balance		$ 554
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Loans [Member]
Number of Loans	3	28
Balance Prior to TDR	$ 7,715	$ 10,291
Balance	7,715	10,260
Financial Impact on Date of Restructure	33
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Loans [Member] | Extended Maturity [Member]
Balance	7,715	9,128
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Loans [Member] | Contractual Interest Rate Reduction [Member]
Balance		$ 1,132
Commercial Real Estate Portfolio Segment [Member] | Commercial Loans [Member]
Number of Loans	11
Balance Prior to TDR	$ 2,691
Balance	2,604
Financial Impact on Date of Restructure
Commercial Real Estate Portfolio Segment [Member] | Commercial Loans [Member] | Extended Maturity [Member]
Balance	2,565
Commercial Real Estate Portfolio Segment [Member] | Commercial Loans [Member] | Contractual Interest Rate Reduction [Member]
Balance	$ 39
Commercial Portfolio Segment [Member]
Number of Loans	11	17
Balance Prior to TDR	$ 2,691	$ 1,996
Balance	2,604	1,968
Financial Impact on Date of Restructure
Commercial Portfolio Segment [Member] | Extended Maturity [Member]
Balance	2,565	1,968
Commercial Portfolio Segment [Member] | Contractual Interest Rate Reduction [Member]
Balance	$ 39
Commercial Portfolio Segment [Member] | Commercial Loans [Member]
Number of Loans		17
Balance Prior to TDR		$ 1,996
Balance		1,968
Financial Impact on Date of Restructure
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Extended Maturity [Member]
Balance		1,968
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Contractual Interest Rate Reduction [Member]
Balance
Consumer Portfolio Segment [Member]
Number of Loans		2
Balance Prior to TDR		$ 50
Balance		11
Financial Impact on Date of Restructure
Consumer Portfolio Segment [Member] | Extended Maturity [Member]
Balance		11
Consumer Portfolio Segment [Member] | Contractual Interest Rate Reduction [Member]
Balance
Consumer Portfolio Segment [Member] | Other Loans [Member]
Number of Loans		2
Balance Prior to TDR		$ 50
Balance		11
Financial Impact on Date of Restructure
Consumer Portfolio Segment [Member] | Other Loans [Member] | Extended Maturity [Member]
Balance		11
Consumer Portfolio Segment [Member] | Other Loans [Member] | Contractual Interest Rate Reduction [Member]
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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
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