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Note 8 - Loans and Related Allowance for Loan and Lease Losses - Allowance for Loan Losses (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Dec. 31, 2017
Individually evaluated for impairment					$ 1,569,000	$ 1,567,000
Collectively evaluated for impairment					5,933,000	5,623,000
Total ending allowance balance	$ 7,502,000	$ 6,605,000	$ 7,502,000	$ 6,598,000	7,502,000	7,190,000
ALLL balance, period start	7,551,000	6,720,000	7,190,000	6,598,000
Charge-offs	(315,000)	(474,000)	(329,000)	(682,000)
Recoveries	56,000	189,000	221,000	354,000
Provision	210,000	170,000	420,000	335,000
ALLL balance, period end	7,502,000	6,605,000	7,502,000	6,605,000
Commercial And Industrial [Member]
Individually evaluated for impairment					879,000	694,000
Collectively evaluated for impairment					301,000	305,000
Total ending allowance balance	1,180,000	613,000	1,180,000	448,000	1,180,000	999,000
ALLL balance, period start	1,256,000	616,000	999,000	448,000
Charge-offs		(415,000)	(9,000)	(435,000)
Recoveries	29,000	65,000	140,000	144,000
Provision	(105,000)	347,000	50,000	456,000
ALLL balance, period end	1,180,000	613,000	1,180,000	613,000
Real Estate Construction Porfolio Segment [Member]
Individually evaluated for impairment
Collectively evaluated for impairment					89,000	313,000
Total ending allowance balance	89,000	202,000	89,000	172,000	89,000	313,000
ALLL balance, period start	92,000	186,000	313,000	172,000
Charge-offs
Recoveries		6,000	17,000	22,000
Provision	(3,000)	10,000	(241,000)	8,000
ALLL balance, period end	89,000	202,000	89,000	202,000
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]
Individually evaluated for impairment					82,000	140,000
Collectively evaluated for impairment					1,661,000	1,620,000
Total ending allowance balance	1,743,000	1,767,000	1,743,000	2,818,000	1,743,000	1,760,000
ALLL balance, period start	1,782,000	2,523,000	1,760,000	2,818,000
Charge-offs	(74,000)	(7,000)	(74,000)	(74,000)
Recoveries	10,000	7,000	29,000	14,000
Provision	25,000	(756,000)	28,000	(991,000)
ALLL balance, period end	1,743,000	1,767,000	1,743,000	1,767,000
Real Estate Mortgage Portfolio Segment [Member] | Commercial Loans [Member]
Individually evaluated for impairment					607,000	733,000
Collectively evaluated for impairment					3,754,000	3,303,000
Total ending allowance balance	4,361,000	4,012,000	4,361,000	3,135,000	4,361,000	4,036,000
ALLL balance, period start	4,323,000	3,378,000	4,036,000	3,135,000
Charge-offs	(111,000)		(111,000)	(19,000)
Recoveries
Provision	149,000	634,000	436,000	896,000
ALLL balance, period end	4,361,000	4,012,000	4,361,000	4,012,000
Consumer Portfolio Segment [Member]
Individually evaluated for impairment					1,000
Collectively evaluated for impairment					128,000	82,000
Total ending allowance balance	129,000	11,000	129,000	25,000	$ 129,000	$ 82,000
ALLL balance, period start	98,000	17,000	82,000	25,000
Charge-offs	(130,000)	(52,000)	(135,000)	(154,000)
Recoveries	17,000	111,000	35,000	174,000
Provision	144,000	(65,000)	147,000	(34,000)
ALLL balance, period end	$ 129,000	$ 11,000	$ 129,000	$ 11,000

X

- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(4)
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- Definition

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 valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

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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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Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

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