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Note 5 - Allowance for Loan Losses and Reserve for Unfunded Lending Commitments - Changes in Allowance for Loan Losses and Reserve for Unfunded Lending Commitments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Jun. 30, 2020	Dec. 31, 2019
Balance			$ 13,152	$ 12,805	$ 12,805
Provision for loan losses	$ 4,759	$ (10)	5,712	6	456
Charge-offs			(549)	(123)	(333)
Recoveries			192	98	224
Balance	18,507	12,786	18,507	12,786	13,152
Individually evaluated for impairment						$ 286	$ 230
Collectively evaluated for impairment						17,969	12,684
Allowance for loan losses	18,507	12,786	13,152	12,786	12,805	18,507	13,152
Individually evaluated for impairment						3,219	2,192
Collectively evaluated for impairment						2,060,118	1,785,595
Loans and Leases Receivable, Net of Deferred Income, Total						2,101,711	1,830,815
Financial Asset Acquired with Credit Deterioration [Member]
Balance			238
Balance	252		252		238
Allowance for loan losses	252		238		238	252	238
Loans and Leases Receivable, Net of Deferred Income, Total						38,374	43,028
Unfunded Loan Commitment [Member]
Balance, beginning of period			329	217	217
Provision for unfunded commitments			12	99	112
Balance, end of period	341	$ 316	341	316	329
Commercial Portfolio Segment [Member]
Balance			2,657	2,537	2,537
Provision for loan losses			967		119
Charge-offs			(411)		(12)
Recoveries			26		13
Balance	3,239		3,239		2,657
Individually evaluated for impairment						122	204
Collectively evaluated for impairment						3,097	2,448
Allowance for loan losses	3,239		3,239	2,537	2,537	3,239	2,657
Individually evaluated for impairment						149	784
Collectively evaluated for impairment						566,162	337,312
Loans and Leases Receivable, Net of Deferred Income, Total						566,859	339,077
Commercial Portfolio Segment [Member] \| Financial Asset Acquired with Credit Deterioration [Member]
Balance			5
Balance	20		20		5
Allowance for loan losses	20		5		5	20	5
Loans and Leases Receivable, Net of Deferred Income, Total						548	981
Commercial Real Estate Portfolio Segment [Member]
Balance			7,416	7,246	7,246
Provision for loan losses			3,783		167
Charge-offs			0		(6)
Recoveries			58		9
Balance	11,257		11,257		7,416
Individually evaluated for impairment						138	0
Collectively evaluated for impairment						11,092	7,386
Allowance for loan losses	11,257		11,257	7,246	7,246	11,257	7,416
Individually evaluated for impairment						1,879	502
Collectively evaluated for impairment						1,088,707	1,004,296
Loans and Leases Receivable, Net of Deferred Income, Total						1,120,160	1,037,119
Commercial Real Estate Portfolio Segment [Member] \| Financial Asset Acquired with Credit Deterioration [Member]
Balance			30
Balance	27		27		30
Allowance for loan losses	27		30		30	27	30
Loans and Leases Receivable, Net of Deferred Income, Total						29,574	32,321
Residential Portfolio Segment [Member]
Balance			3,023	2,977	2,977
Provision for loan losses			942		58
Charge-offs			(62)		(70)
Recoveries			33		58
Balance	3,936		3,936		3,023
Individually evaluated for impairment						26	26
Collectively evaluated for impairment						3,705	2,794
Allowance for loan losses	3,936		3,936	2,977	2,977	3,936	3,023
Individually evaluated for impairment						1,191	906
Collectively evaluated for impairment						396,211	433,121
Loans and Leases Receivable, Net of Deferred Income, Total						405,639	443,738
Residential Portfolio Segment [Member] \| Financial Asset Acquired with Credit Deterioration [Member]
Balance			203
Balance	205		205		203
Allowance for loan losses	205		203		203	205	203
Loans and Leases Receivable, Net of Deferred Income, Total						8,237	9,711
Consumer Portfolio Segment [Member]
Balance			56	45	45
Provision for loan losses			20		112
Charge-offs			(76)		(245)
Recoveries			75		144
Balance	75		75		56
Individually evaluated for impairment						0	0
Collectively evaluated for impairment						75	56
Allowance for loan losses	75		75	$ 45	45	75	56
Individually evaluated for impairment						0	0
Collectively evaluated for impairment						9,038	10,866
Loans and Leases Receivable, Net of Deferred Income, Total						9,053	10,881
Consumer Portfolio Segment [Member] \| Financial Asset Acquired with Credit Deterioration [Member]
Balance			0
Balance	0		0		0
Allowance for loan losses	$ 0		$ 0		$ 0	0	0
Loans and Leases Receivable, Net of Deferred Income, Total						$ 15	$ 15