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Note 3 - Available-for-sale Securities (Details Textual)	3 Months Ended	6 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	25	25		22
Number of Available-for-sale Securities	52	52		37
Unrealized Holding Losses Depreciation Percentage from Amortized Cost	1.10%	1.10%		4.00%
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Total		$ 0
Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale, Total		0
Payments to Acquire Debt Securities, Available-for-sale			$ 0
Proceeds from Sale of Debt Securities, Available-for-sale			0
Debt Securities, Available-for-sale, Realized Gain (Loss), Total	$ 93,000	93,000	$ (0)
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Payments to Acquire Debt Securities, Available-for-sale		61,700,000
Proceeds from Sale of Debt Securities, Available-for-sale		4,300,000
Corporate Debt Securities [Member]
Payments to Acquire Debt Securities, Available-for-sale		14,200,000
Proceeds from Sale of Debt Securities, Available-for-sale		14,000,000.0
SBA Loan Pools [Member]
Payments to Acquire Debt Securities, Available-for-sale		5,900,000
Subordinated Notes [Member]
Proceeds from Sale of Debt Securities, Available-for-sale		4,500,000
Available-For-Sale Securities Pledged to Secure Municipal Deposits [Member]
Debt Securities, Available-for-sale, Restricted	$ 8,600,000	$ 8,600,000		$ 6,100,000

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- Definition

The number of available-for-sale securities held.

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- Definition

Amount of 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

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-Publisher FASB
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-SubTopic 10
-Section 50
-Paragraph 9
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Amount of restricted investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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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.

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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).

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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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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).

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