Note 4 - Loans and Allowance for Loan Losses - Allowance for Loan Losses Activity by Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Balance	$ 6,728	$ 7,499
Provision for loan losses	2,378	756
Loans charged off	(1,361)	(587)
Recoveries	268	328
Balance	8,013	7,996
Residential Portfolio Segment [Member]
Balance	1,583	1,470
Provision for loan losses	813	594
Loans charged off	(329)	(60)
Recoveries	12	55
Balance	2,079	2,059
Commercial Real Estate Portfolio Segment [Member]
Balance	2,186	2,978
Provision for loan losses	393	(581)
Loans charged off	(141)	(1)
Recoveries	14	27
Balance	2,452	2,423
Commercial and Industrial Portfolio Segment [Member]
Balance	1,063	1,024
Provision for loan losses	473	316
Loans charged off	(233)	(4)
Recoveries	12	37
Balance	1,315	1,373
Consumer Portfolio Segment [Member]
Balance	1,896	2,027
Provision for loan losses	699	427
Loans charged off	(658)	(522)
Recoveries	230	209
Balance	$ 2,167	$ 2,141