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Note 2 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($)		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Investment securities gains on sale, net	[1]				$ 488,000
Equity Securities, FV-NI, Unrealized Gain (Loss), Total	[1]	13,000		31,000
Earnings on bank-owned life insurance	[1]	98,000	98,000	210,000	207,000
Gain on sale of loans	[1]	117,000	231,000	121,000	465,000
Total noninterest income		1,005,000	989,000	1,791,000	2,500,000
Overdraft Fees [Member]
Noninterest income revenue		197,000	182,000	390,000	374,000
ATM Banking Fees [Member]
Noninterest income revenue		214,000	205,000	415,000	319,000
Service Charge and Other Fees [Member]
Noninterest income revenue		61,000	62,000	120,000	225,000
Financial Service, Other [Member]
Noninterest income revenue		$ 305,000	$ 211,000	$ 504,000	$ 422,000
[1] Not within scope of ASC 606.

X

- Definition

Earnings on or other increases in the value of the cash surrender value of bank owned life insurance policies.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.13)
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- Definition

Amount of unrealized and realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

No definition available.

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- Definition

Amount of unrealized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
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- Definition

The net gain (loss) resulting from a sale of loans, including adjustments to record loans classified as held-for-sale at the lower-of-cost-or-market and fair value adjustments to loan held for investment purposes.

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- Definition

The total amount of noninterest income which may be derived from: (1) fees and commissions; (2) premiums earned; (3) insurance policy charges; (4) the sale or disposal of assets; and (5) other sources not otherwise specified.

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Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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