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Note 4 - Loan Receivable and Allowance for Loan and Lease Losses - Allowance for Loan Losses (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Jun. 30, 2021	Dec. 31, 2020
Balance	$ 10,362,000	$ 11,148,000	$ 10,584,000	$ 10,115,000
Charge-offs	(6,000)	(75,000)	(358,000)	(810,000)
Recoveries	23,000	13,000	153,000	67,000
Provisions (credits)	(300,000)	85,000	(300,000)	1,799,000
Balance	10,079,000	11,171,000	10,079,000	11,171,000
Total allowance for loan and lease losses	10,079,000	11,171,000	10,079,000	11,171,000	$ 10,362,000	$ 10,584,000
Loans receivable, gross: Collectively evaluated for impairment	100,000		100,000
Total loans receivable, gross	714,538,000		714,538,000			730,180,000
Business Activities Loans [Member]
Balance			10,584,000
Balance	10,079,000		10,079,000
Allowance for loan losses: Individually evaluated for impairment	1,820,000		1,820,000			1,412,000
Allowance for loan losses: Collectively evaluated for impairment	8,259,000		8,259,000			9,172,000
Total allowance for loan and lease losses	10,079,000		10,079,000			10,584,000
Loans receivable, gross: Individually evaluated for impairment	28,161,000		28,161,000			24,383,000
Loans receivable, gross: Collectively evaluated for impairment	686,377,000		686,377,000			705,797,000
Total loans receivable, gross	714,538,000		714,538,000		714,538,000	730,180,000
Commercial Real Estate Portfolio Segment [Member]
Balance	4,079,000	4,274,000	4,485,000	3,789,000
Charge-offs	0	(35,000)	(51,000)	(400,000)
Recoveries	0	0	0	0
Provisions (credits)	607,000	158,000	252,000	1,008,000
Balance	4,686,000	4,397,000	4,686,000	4,397,000
Total allowance for loan and lease losses	4,686,000	4,397,000	4,686,000	4,397,000	4,079,000	4,485,000
Total loans receivable, gross	315,853,000		315,853,000			282,378,000
Commercial Real Estate Portfolio Segment [Member] | Business Activities Loans [Member]
Balance			4,485,000
Balance	4,686,000		4,686,000
Allowance for loan losses: Individually evaluated for impairment	1,178,000		1,178,000			1,398,000
Allowance for loan losses: Collectively evaluated for impairment	3,508,000		3,508,000			3,087,000
Total allowance for loan and lease losses	4,686,000		4,686,000			4,485,000
Loans receivable, gross: Individually evaluated for impairment	19,223,000		19,223,000			14,534,000
Loans receivable, gross: Collectively evaluated for impairment	296,630,000		296,630,000			267,844,000
Total loans receivable, gross	315,853,000		315,853,000		315,853,000	282,378,000
Residential Portfolio Segment [Member]
Balance	2,003,000	1,910,000	1,379,000	1,038,000
Charge-offs	0	0	(3,000)	(13,000)
Recoveries	2,000	1,000	2,000	1,000
Provisions (credits)	130,000	(374,000)	757,000	511,000
Balance	2,135,000	1,537,000	2,135,000	1,537,000
Total allowance for loan and lease losses	2,135,000	1,537,000	2,135,000	1,537,000	2,003,000	1,379,000
Total loans receivable, gross	171,800,000		171,800,000			153,851,000
Residential Portfolio Segment [Member] | Business Activities Loans [Member]
Balance			1,379,000
Balance	2,135,000		2,135,000
Allowance for loan losses: Individually evaluated for impairment	4,000		4,000			4,000
Allowance for loan losses: Collectively evaluated for impairment	2,131,000		2,131,000			1,375,000
Total allowance for loan and lease losses	2,135,000		2,135,000			1,379,000
Loans receivable, gross: Individually evaluated for impairment	4,329,000		4,329,000			3,962,000
Loans receivable, gross: Collectively evaluated for impairment	167,471,000		167,471,000			149,889,000
Total loans receivable, gross	171,800,000		171,800,000		171,800,000	153,851,000
Commercial Portfolio Segment [Member]
Balance	3,212,000	3,526,000	3,284,000	4,340,000
Charge-offs	(3,000)	(34,000)	(212,000)	(352,000)
Recoveries	20,000	11,000	44,000	62,000
Provisions (credits)	(861,000)	(33,000)	(748,000)	(580,000)
Balance	2,368,000	3,470,000	2,368,000	3,470,000
Total allowance for loan and lease losses	2,368,000	3,470,000	2,368,000	3,470,000	3,212,000	3,284,000
Total loans receivable, gross	119,688,000		119,688,000			144,297,000
Commercial Portfolio Segment [Member] | Business Activities Loans [Member]
Balance			3,284,000
Balance	2,368,000		2,368,000
Allowance for loan losses: Individually evaluated for impairment	638,000		638,000			0
Allowance for loan losses: Collectively evaluated for impairment	1,730,000		1,730,000			3,284,000
Total allowance for loan and lease losses	2,368,000		2,368,000			3,284,000
Loans receivable, gross: Individually evaluated for impairment	4,084,000		4,084,000			4,700,000
Loans receivable, gross: Collectively evaluated for impairment	115,604,000		115,604,000			139,597,000
Total loans receivable, gross	119,688,000		119,688,000		119,688,000	144,297,000
Consumer Portfolio Segment [Member]
Balance	390,000	534,000	295,000	341,000
Charge-offs	(3,000)	(6,000)	(23,000)	(45,000)
Recoveries	1,000	1,000	107,000	4,000
Provisions (credits)	(53,000)	11,000	(44,000)	240,000
Balance	335,000	540,000	335,000	540,000
Total allowance for loan and lease losses	335,000	540,000	335,000	540,000	390,000	295,000
Total loans receivable, gross	53,676,000		53,676,000			67,635,000
Consumer Portfolio Segment [Member] | Business Activities Loans [Member]
Balance			295,000
Balance	335,000		335,000
Allowance for loan losses: Individually evaluated for impairment	0		0			10,000
Allowance for loan losses: Collectively evaluated for impairment	335,000		335,000			285,000
Total allowance for loan and lease losses	335,000		335,000			295,000
Loans receivable, gross: Individually evaluated for impairment	525,000		525,000			1,187,000
Loans receivable, gross: Collectively evaluated for impairment	53,151,000		53,151,000			66,448,000
Total loans receivable, gross	53,676,000		53,676,000		53,676,000	67,635,000
Construction Portfolio Segment [Member]
Balance	369,000	666,000	739,000	477,000
Charge-offs	0	0	(69,000)	0
Recoveries	0	0	0	0
Provisions (credits)	(138,000)	152,000	(439,000)	341,000
Balance	231,000	818,000	231,000	818,000
Total allowance for loan and lease losses	231,000	818,000	231,000	818,000	369,000	739,000
Total loans receivable, gross	41,609,000		41,609,000			66,984,000
Construction Portfolio Segment [Member] | Business Activities Loans [Member]
Balance			739,000
Balance	231,000		231,000
Allowance for loan losses: Individually evaluated for impairment	0		0			0
Allowance for loan losses: Collectively evaluated for impairment	231,000		231,000			739,000
Total allowance for loan and lease losses	231,000		231,000			739,000
Loans receivable, gross: Individually evaluated for impairment	0		0			0
Loans receivable, gross: Collectively evaluated for impairment	41,609,000		41,609,000			66,984,000
Total loans receivable, gross	41,609,000		41,609,000		41,609,000	66,984,000
Construction to Permanent Portfolio Segment [Member]
Balance	144,000	149,000	162,000	130,000
Charge-offs	0	0		0
Recoveries	0	0	0	0
Provisions (credits)	(82,000)	40,000	(100,000)	59,000
Balance	62,000	189,000	62,000	189,000
Total allowance for loan and lease losses	62,000	189,000	62,000	189,000	144,000	162,000
Total loans receivable, gross	11,912,000		11,912,000			15,035,000
Construction to Permanent Portfolio Segment [Member] | Business Activities Loans [Member]
Balance			162,000
Balance	62,000		62,000
Allowance for loan losses: Individually evaluated for impairment	0		0			0
Allowance for loan losses: Collectively evaluated for impairment	62,000		62,000			162,000
Total allowance for loan and lease losses	62,000		62,000			162,000
Loans receivable, gross: Individually evaluated for impairment	0		0			0
Loans receivable, gross: Collectively evaluated for impairment	11,912,000		11,912,000			15,035,000
Total loans receivable, gross	11,912,000		11,912,000		11,912,000	15,035,000
Unallocated Financing Receivables [Member]
Balance	165,000	89,000	240,000	0
Charge-offs	0	0		0
Recoveries	0	0	0	0
Provisions (credits)	97,000	131,000	22,000	220,000
Balance	262,000	220,000	262,000	220,000
Total allowance for loan and lease losses	262,000	$ 220,000	262,000	$ 220,000	$ 165,000	240,000
Unallocated Financing Receivables [Member] | Business Activities Loans [Member]
Balance			240,000
Balance	262,000		262,000
Allowance for loan losses: Individually evaluated for impairment	0		0			0
Allowance for loan losses: Collectively evaluated for impairment	262,000		262,000			240,000
Total allowance for loan and lease losses	262,000		262,000			240,000
Loans receivable, gross: Individually evaluated for impairment	0		0			0
Loans receivable, gross: Collectively evaluated for impairment	0		0			0
Total loans receivable, gross	$ 0		$ 0			$ 0

X

- Definition

Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts.

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Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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