Note 5 - Credit Quality - Nonaccrual Loans by Loan Class (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Total nonaccrual loans	$ 19,905	$ 19,339
Non-covered Loans [Member]
Total nonaccrual loans	19,583	18,997
Covered Loans [Member]
Total nonaccrual loans	322	342
Commercial Portfolio Segment [Member] | Construction, Development and Other Land [Member]
Total nonaccrual loans	413
Commercial Portfolio Segment [Member] | Construction, Development and Other Land [Member] | Non-covered Loans [Member]
Total nonaccrual loans	413
Commercial Portfolio Segment [Member] | Construction, Development and Other Land [Member] | Covered Loans [Member]
Total nonaccrual loans
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Total nonaccrual loans	428	211
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Non-covered Loans [Member]
Total nonaccrual loans	428	211
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Covered Loans [Member]
Total nonaccrual loans
Commercial Portfolio Segment [Member] | Multi-family Residential [Member]
Total nonaccrual loans	1,395	498
Commercial Portfolio Segment [Member] | Multi-family Residential [Member] | Non-covered Loans [Member]
Total nonaccrual loans	1,395	498
Commercial Portfolio Segment [Member] | Multi-family Residential [Member] | Covered Loans [Member]
Total nonaccrual loans
Commercial Portfolio Segment [Member] | Single Family Non-owner Occupied [Member]
Total nonaccrual loans	1,711	870
Commercial Portfolio Segment [Member] | Single Family Non-owner Occupied [Member] | Non-covered Loans [Member]
Total nonaccrual loans	1,696	851
Commercial Portfolio Segment [Member] | Single Family Non-owner Occupied [Member] | Covered Loans [Member]
Total nonaccrual loans	15	19
Commercial Portfolio Segment [Member] | Non-farm, Non-residential [Member]
Total nonaccrual loans	4,020	2,448
Commercial Portfolio Segment [Member] | Non-farm, Non-residential [Member] | Non-covered Loans [Member]
Total nonaccrual loans	4,020	2,448
Commercial Portfolio Segment [Member] | Non-farm, Non-residential [Member] | Covered Loans [Member]
Total nonaccrual loans
Commercial Portfolio Segment [Member] | Agricultural [Member]
Total nonaccrual loans	86	102
Commercial Portfolio Segment [Member] | Agricultural [Member] | Non-covered Loans [Member]
Total nonaccrual loans	86	102
Commercial Portfolio Segment [Member] | Agricultural [Member] | Covered Loans [Member]
Total nonaccrual loans
Commercial Portfolio Segment [Member] | Farmland [Member]
Total nonaccrual loans	711	805
Commercial Portfolio Segment [Member] | Farmland [Member] | Non-covered Loans [Member]
Total nonaccrual loans	711	805
Commercial Portfolio Segment [Member] | Farmland [Member] | Covered Loans [Member]
Total nonaccrual loans
Consumer Real Estate Portfolio Segment [Member] | Home Equity Lines [Member]
Total nonaccrual loans	885	1,188
Consumer Real Estate Portfolio Segment [Member] | Home Equity Lines [Member] | Non-covered Loans [Member]
Total nonaccrual loans	614	882
Consumer Real Estate Portfolio Segment [Member] | Home Equity Lines [Member] | Covered Loans [Member]
Total nonaccrual loans	271	306
Consumer Real Estate Portfolio Segment [Member] | Single Family Owner Occupied [Member]
Total nonaccrual loans	10,177	13,125
Consumer Real Estate Portfolio Segment [Member] | Single Family Owner Occupied [Member] | Non-covered Loans [Member]
Total nonaccrual loans	10,141	13,108
Consumer Real Estate Portfolio Segment [Member] | Single Family Owner Occupied [Member] | Covered Loans [Member]
Total nonaccrual loans	36	17
Consumer and Other Portfolio Segment [Member] | Consumer Loans [Member]
Total nonaccrual loans	79	92
Consumer and Other Portfolio Segment [Member] | Consumer Loans [Member] | Non-covered Loans [Member]
Total nonaccrual loans	79	92
Consumer and Other Portfolio Segment [Member] | Consumer Loans [Member] | Covered Loans [Member]
Total nonaccrual loans