Note 4 - Loans and Leases - Non-accrual Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Non-accrual loans	$ 3,273	$ 2,611
Commercial and Industrial Portfolio Segment [Member]
Non-accrual loans	193	192
Construction and Development Excluding Undeveloped Land Portfolio Segment [Member]
Non-accrual loans		318
Undevelopment Land Portfolio Segment [Member]
Non-accrual loans		474
Real Estate Mortgage Portfolio Segment [Member]
Non-accrual loans	3,080	1,627
Real Estate Mortgage Portfolio Segment [Member] | Commercial Investment [Member]
Non-accrual loans	317	138
Real Estate Mortgage Portfolio Segment [Member] | Owner Occupied Commercial [Member]
Non-accrual loans	1,466	586
Real Estate Mortgage Portfolio Segment [Member] | One to Four Family Residential [Member]
Non-accrual loans	843	760
Real Estate Mortgage Portfolio Segment [Member] | Home Equity First Lien [Member]
Non-accrual loans
Real Estate Mortgage Portfolio Segment [Member] | Home Equity Junior Lien [Member]
Non-accrual loans	454	143
Consumer Portfolio Segment [Member]
Non-accrual loans