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Note 2 - Revenue Recognition - Disaggregation of Revenue (Details) - USD ($)		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Gain on equity securities	[1]	$ 102,000	$ (28,000)	$ 223,000	$ (157,000)
Earnings on bank-owned life insurance	[1]	108,000	109,000	440,000	321,000
Gain on sale of loans	[1]	309,000	660,000	1,122,000	1,155,000
Revenue from investment services		190,000	132,000	529,000	400,000
Other income		236,000	247,000	838,000	851,000
Total noninterest income		1,821,000	1,811,000	5,671,000	4,380,000
Net loss (gain) on other real estate owned		9,000	(225,000)	77,000	(257,000)
Overdraft Fees [Member]
Noninterest income revenue		192,000	163,000	523,000	475,000
ATM Banking Fees [Member]
Noninterest income revenue		354,000	298,000	1,026,000	771,000
Service Charge and Other Fees [Member]
Noninterest income revenue		$ 330,000	$ 230,000	$ 970,000	$ 564,000
[1] Not within scope of ASC 606

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

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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).

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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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The net gain (loss) resulting from sales and other disposals of other real estate owned, increases (decreases) in the valuation allowance for foreclosed real estate, and write-downs of other real estate owned after acquisition or physical possession.

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Amount of fees and commissions from banking, advisory, brokerage, and securities underwriting activities. Activities include, but are not limited to, underwriting securities, private placements of securities, investment advisory and management services, merger and acquisition services, sale and servicing of mutual funds, and other related consulting fees.

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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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