Note 9 - Revenues from Contracts with Customers - Noninterest Income (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Deposit service charges and fees		$ 833	$ 983	$ 2,456	$ 2,887
Loan servicing fees	[1]	44	99	189	178
Mortgage brokerage and banking fees	[1]	44	28	84	77
Gain on sale of equity securities	[1]	0	0	0	295
Loss on disposal of other assets		0	0	(2)	(19)
Earnings on bank-owned life insurance	[1]	10	37	51	105
Other	[1]	111	129	319	374
Total noninterest income		1,264	1,474	3,825	4,524
Deposit Account [Member]
Deposit service charges and fees		833	983	2,456	2,887
Bank Servicing [Member]
Deposit service charges and fees		$ 222	$ 198	$ 728	$ 627

[1] Not within the scope of ASC 606