Note 5 - Loans - Non-accrual Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Non-accrual loans	$ 11,494	$ 2,611
Past Due 90-Days-or-More and Still Accruing Interest	535	745
Commercial and Industrial Portfolio Segment [Member]
Non-accrual loans	8,202	192
Past Due 90-Days-or-More and Still Accruing Interest	0	12
Construction and Development Excluding Undeveloped Land Portfolio Segment [Member]
Non-accrual loans	0	318
Past Due 90-Days-or-More and Still Accruing Interest	0	0
Undevelopment Land Portfolio Segment [Member]
Non-accrual loans	0	474
Past Due 90-Days-or-More and Still Accruing Interest	0	0
Real Estate Mortgage Portfolio Segment [Member]
Non-accrual loans	3,292	1,627
Past Due 90-Days-or-More and Still Accruing Interest	535	733
Real Estate Mortgage Portfolio Segment [Member] | Commercial Investment [Member]
Non-accrual loans	740	138
Past Due 90-Days-or-More and Still Accruing Interest	396	99
Real Estate Mortgage Portfolio Segment [Member] | Owner Occupied Commercial [Member]
Non-accrual loans	2,278	586
Past Due 90-Days-or-More and Still Accruing Interest	0	535
Real Estate Mortgage Portfolio Segment [Member] | One to Four Family Residential [Member]
Non-accrual loans	123	760
Past Due 90-Days-or-More and Still Accruing Interest	104	0
Real Estate Mortgage Portfolio Segment [Member] | Home Equity First Lien [Member]
Non-accrual loans	0	0
Past Due 90-Days-or-More and Still Accruing Interest	0	0
Real Estate Mortgage Portfolio Segment [Member] | Home Equity Junior Lien [Member]
Non-accrual loans	151	143
Past Due 90-Days-or-More and Still Accruing Interest	35	99
Consumer Portfolio Segment [Member]
Non-accrual loans	0	0
Past Due 90-Days-or-More and Still Accruing Interest	$ 0	$ 0