Note 18 - Revenue Recognition - Noninterest Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Noninterest Income (in-scope of Topic 606)	$ 6,266	$ 6,114	$ 5,412
Noninterest Income (out-of-scope of Topic 606)	1,463	1,522	1,703
Total noninterest income	7,729	7,636	7,115
Deposit Account [Member]
Noninterest Income (in-scope of Topic 606)	2,678	2,776	2,458
Product and Service, Other [Member]
Noninterest Income (in-scope of Topic 606)	132	205	212
Credit and Debit Card [Member]
Noninterest Income (in-scope of Topic 606)	1,431	1,205	981
Fiduciary and Trust [Member]
Noninterest Income (in-scope of Topic 606)	1,565	1,530	1,346
Insurance and Investment [Member]
Noninterest Income (in-scope of Topic 606)	$ 460	$ 398	$ 415