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Note 3 - Available-for-sale Securities (Details Textual)	9 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	19		15
Number of Available-for-sale Securities	34		27
Unrealized Holding Losses Depreciation Percentage from Amortized Cost	3.70%		3.70%
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Total	$ 0
Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale, Total	0
Proceeds from Sale of Debt Securities, Available-for-sale	0	$ 0
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Payments to Acquire Debt Securities, Available-for-sale	4,900,000
SBA Loan Pools [Member]
Payments to Acquire Debt Securities, Available-for-sale	988,000	5,500,000
US States and Political Subdivisions Debt Securities [Member]
Payments to Acquire Debt Securities, Available-for-sale	$ 565,000
Subordinated Notes [Member]
Payments to Acquire Debt Securities, Available-for-sale		3,500,000
Corporate Debt Securities [Member]
Payments to Acquire Debt Securities, Available-for-sale		4,000,000
Available-For-Sale Securities Pledged to Secure Municipal Deposits [Member]
Debt Securities, Available-for-sale, Restricted		$ 3,700,000	$ 4,800,000

X

- Definition

The number of available-for-sale securities held.

+ References

No definition available.

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- Definition

Unrealized holding losses depreciation percentage from amortized cost.

+ References

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- Definition

Amount of restricted investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 30
-Section 50
-Paragraph 1A
-Subparagraph (b)(1)(i)
-URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729

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- Definition

Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (b)(3)
-URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27290-111563

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-Section 50
-Paragraph 4
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Amount of other-than-temporary impairment (OTTI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), recognized in earnings and other comprehensive loss (OCI).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 8A
-URI http://asc.fasb.org/extlink&oid=121553693&loc=SL6284422-111562

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- Definition

The amount by which the fair value of an investment in debt and equity securities categorized as Available-for-sale is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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- Definition

Amount of cash outflow to acquire investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
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- Definition

Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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