Note 4 - Loans - Allowance for Credit Losses and Recorded Investment in Financing Receivables (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2021		Mar. 31, 2020	Mar. 31, 2021		Dec. 31, 2020
Balance		$ 16,910		$ 12,231
Charge-offs		(90)		(169)
Recoveries		207		155
Provision for loan and lease losses		0		2,850
Balance		17,027		15,067
Individually evaluated for impairment					$ 188		$ 192
Collectively evaluated for impairment					16,839		16,718
Total		17,027		15,067	17,027		16,910
Individually evaluated for impairment					7,959		11,103
Collectively evaluated for impairment					1,137,984		1,128,629
Total gross loans					1,145,943		1,139,732
SBA CARES Act Paycheck Protection Program [Member]
Balance		0	[1]	0
Charge-offs		0	[1]	0
Recoveries		0	[1]	0
Provision for loan and lease losses		0	[1]	0
Balance		0	[1]	0
Individually evaluated for impairment	[1]				0		0
Collectively evaluated for impairment	[1]				0		0
Total		0	[1]	0	0	[1]	0	[1]
Individually evaluated for impairment	[1]				0		0
Collectively evaluated for impairment	[1]				117,991		130,814
Total gross loans	[1]				117,991		130,814
Commercial Portfolio Segment [Member]
Balance		2,402		1,822
Charge-offs		0		0
Recoveries		10		7
Provision for loan and lease losses		(46)		654
Balance		2,366		2,483
Individually evaluated for impairment					114		114
Collectively evaluated for impairment					2,252		2,288
Total		2,366		2,483	2,366		2,402
Individually evaluated for impairment					2,014		2,033
Collectively evaluated for impairment					115,583		113,526
Total gross loans					117,597		115,559
Commercial Portfolio Segment [Member] | SBA CARES Act Paycheck Protection Program [Member]
Total gross loans					117,991		130,814
Commercial Real Estate Portfolio Segment [Member]
Balance		11,895		8,096
Charge-offs		0		0
Recoveries		110		0
Provision for loan and lease losses		248		1,803
Balance		12,253		9,899
Individually evaluated for impairment					0		0
Collectively evaluated for impairment					12,253		11,895
Total		12,253		9,899	12,253		11,895
Individually evaluated for impairment					721		3,734
Collectively evaluated for impairment					788,948		763,802
Total gross loans					789,669		767,536
Residential Portfolio Segment [Member]
Balance		1,324		1,032
Charge-offs		(22)		(6)
Recoveries		25		44
Provision for loan and lease losses		(106)		211
Balance		1,221		1,281
Individually evaluated for impairment					70		74
Collectively evaluated for impairment					1,151		1,250
Total		1,221		1,281	1,221		1,324
Individually evaluated for impairment					5,207		5,318
Collectively evaluated for impairment					95,794		98,536
Total gross loans					101,001		103,854
Consumer Portfolio Segment [Member]
Balance		683		933
Charge-offs		(68)		(163)
Recoveries		62		104
Provision for loan and lease losses		(120)		98
Balance		557		972
Individually evaluated for impairment					4		4
Collectively evaluated for impairment					553		679
Total		557		972	557		683
Individually evaluated for impairment					17		18
Collectively evaluated for impairment					19,668		21,951
Total gross loans					19,685		21,969
Unallocated Financing Receivables [Member]
Balance		606		348
Charge-offs		0		0
Recoveries		0		0
Provision for loan and lease losses		24		84
Balance		630		432
Individually evaluated for impairment					0		0
Collectively evaluated for impairment					630		606
Total		$ 630		$ 432	630		606
Individually evaluated for impairment					0		0
Collectively evaluated for impairment					0		0
Total gross loans					$ 0		$ 0

[1] PPP loans are fully guaranteed by SBA and no allowance is provided for them.