Note 6 - Allowance for Loan Losses - Changes in Allowance for Loan Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Beginning balance	$ 18,267	$ 19,276
Provision for (Recovery of) loan losses charged to operations	3,571	2,393
Charge-offs	(6,261)	(4,907)
Recoveries	2,848	1,505
Net charge-offs	(3,413)	(3,402)
Ending balance	18,425	18,267
Commercial Portfolio Segment [Member]
Beginning balance	10,499	11,672
Provision for (Recovery of) loan losses charged to operations	1,411	(660)
Charge-offs	(2,548)	(1,236)
Recoveries	873	723
Net charge-offs	(1,675)	(513)
Ending balance	10,235	10,499
Consumer Real Estate Portfolio Segment [Member]
Beginning balance	6,732	6,810
Provision for (Recovery of) loan losses charged to operations	(105)	1,473
Charge-offs	(1,790)	(2,005)
Recoveries	1,488	454
Net charge-offs	(302)	(1,551)
Ending balance	6,325	6,732
Consumer and Other Portfolio Segment [Member]
Beginning balance	1,036	794
Provision for (Recovery of) loan losses charged to operations	2,265	1,580
Charge-offs	(1,923)	(1,666)
Recoveries	487	328
Net charge-offs	(1,436)	(1,338)
Ending balance	$ 1,865	$ 1,036