Note 4 - Loans Receivable - Allowance for Loan Losses Activity (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Allowance for loan losses, ending balance	[1]			$ 14,000
Provision for credit losses (1)	[2]	$ 319	$ 858	598	$ 1,137
Allowance for loan losses, ending balance	[1]	15,560		15,560
Loans receivable		1,421,483		1,421,483		$ 1,355,423
Residential Portfolio Segment [Member]
Allowance for loan losses, ending balance		1,580	1,616	1,472	1,596
Charge-offs		0	0	0	0
Recoveries		189	0	195	0
Provision for credit losses (1)		17	27	98	47
Allowance for loan losses, ending balance		1,786	1,643	1,786	1,643
Allowance for loan losses, ending balance, allocated to loans individually evaluated for impairment			199		199
Allowance for loan losses, ending balance, allocated to loans collectively evaluated for impairment			1,444		1,444
Loans receivable		182,953	186,229	182,953	186,229	195,703
Loans receivable, ending balance, loans individually evaluated for impairment			573		573
Loans receivable, ending balance, loans collectively evaluated for impairment			185,656		185,656
Residential Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Allowance for loan losses, ending balance				21
Commercial Real Estate Portfolio Segment [Member]
Allowance for loan losses, ending balance		9,732	7,659	9,037	7,470
Charge-offs		0	0	0	0
Recoveries		6	8	11	14
Provision for credit losses (1)		273	670	429	853
Allowance for loan losses, ending balance		10,011	8,337	10,011	8,337
Allowance for loan losses, ending balance, allocated to loans individually evaluated for impairment			0		0
Allowance for loan losses, ending balance, allocated to loans collectively evaluated for impairment			8,337		8,337
Loans receivable		875,545	743,326	875,545	743,326	826,549
Loans receivable, ending balance, loans individually evaluated for impairment			1,173		1,173
Loans receivable, ending balance, loans collectively evaluated for impairment			742,153		742,153
Commercial Real Estate Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Allowance for loan losses, ending balance				534
Home Equity Portfolio Segment [Member]
Allowance for loan losses, ending balance		513	536	509	533
Charge-offs		0	(32)	0	(32)
Recoveries		9	0	9	0
Provision for credit losses (1)		4	3	5	6
Allowance for loan losses, ending balance		526	507	526	507
Allowance for loan losses, ending balance, allocated to loans individually evaluated for impairment			0		0
Allowance for loan losses, ending balance, allocated to loans collectively evaluated for impairment			507		507
Loans receivable		80,333	62,445	80,333	62,445	74,271
Loans receivable, ending balance, loans individually evaluated for impairment			119		119
Loans receivable, ending balance, loans collectively evaluated for impairment			62,326		62,326
Home Equity Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Allowance for loan losses, ending balance				3
Consumer Portfolio Segment [Member]
Allowance for loan losses, ending balance		344	357	342	365
Charge-offs		(29)	0	(30)	(8)
Recoveries		0	1	1	1
Provision for credit losses (1)		3	3	4	3
Allowance for loan losses, ending balance		318	361	318	361
Allowance for loan losses, ending balance, allocated to loans individually evaluated for impairment			0		0
Allowance for loan losses, ending balance, allocated to loans collectively evaluated for impairment			361		361
Loans receivable		30,065	25,775	30,065	25,775	27,609
Loans receivable, ending balance, loans individually evaluated for impairment			35		35
Loans receivable, ending balance, loans collectively evaluated for impairment			25,740		25,740
Consumer Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Allowance for loan losses, ending balance				1
Commercial Portfolio Segment [Member]
Allowance for loan losses, ending balance		2,831	2,532	2,640	2,536
Charge-offs		(26)	(215)	(26)	(299)
Recoveries		2	5	12	12
Provision for credit losses (1)		112	155	152	228
Allowance for loan losses, ending balance		2,919	2,477	2,919	2,477
Allowance for loan losses, ending balance, allocated to loans individually evaluated for impairment			319		319
Allowance for loan losses, ending balance, allocated to loans collectively evaluated for impairment			2,158		2,158
Loans receivable		252,587	234,741	252,587	234,741	$ 231,291
Loans receivable, ending balance, loans individually evaluated for impairment			1,670		1,670
Loans receivable, ending balance, loans collectively evaluated for impairment			233,071		233,071
Commercial Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Allowance for loan losses, ending balance				141
Loans Excluding Unfunded Commitments [Member]
Allowance for loan losses, ending balance		15,000	12,700	14,000	12,500
Charge-offs		(55)	(247)	(56)	(339)
Recoveries		206	14	228	27
Provision for credit losses (1)		409	858	688	1,137
Allowance for loan losses, ending balance		$ 15,560	13,325	15,560	13,325
Allowance for loan losses, ending balance, allocated to loans individually evaluated for impairment			518		518
Allowance for loan losses, ending balance, allocated to loans collectively evaluated for impairment			12,807		12,807
Loans receivable			1,252,516		1,252,516
Loans receivable, ending balance, loans individually evaluated for impairment			3,570		3,570
Loans receivable, ending balance, loans collectively evaluated for impairment			$ 1,248,946		$ 1,248,946
Loans Excluding Unfunded Commitments [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Allowance for loan losses, ending balance				$ 700

[1] Allowance for credit losses for the quarter ended June 30, 2023; allowance for loan losses for prior periods.

[2] Provision for credit losses for the three and six months ended June 30, 2023; provision for loan losses for the three and six months ended June 30, 2022.