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Note 3 - Available-for-sale Securities (Details Textual)	3 Months Ended	9 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions	31	31		22
Number of Available-for-sale Securities	50	50		37
Unrealized Holding Losses Depreciation Percentage from Amortized Cost	1.60%	1.60%		4.00%
Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale, Total		$ 0
Payments to Acquire Debt Securities, Available-for-sale		136,134,000	$ 6,541,000
Proceeds from Sale of Debt Securities, Available-for-sale			0
Debt Securities, Available-for-sale, Realized Gain (Loss), Total	$ 26,000	119,000	(0)
US Government Agencies Debt Securities [Member]
Payments to Acquire Debt Securities, Available-for-sale		112,000,000.0	4,900,000
Proceeds from Sale of Debt Securities, Available-for-sale		32,400,000
Corporate Debt Securities [Member]
Payments to Acquire Debt Securities, Available-for-sale		18,200,000
Proceeds from Sale of Debt Securities, Available-for-sale		16,300,000
SBA Loan Pools [Member]
Payments to Acquire Debt Securities, Available-for-sale		5,900,000	988,000
Proceeds from Sale of Debt Securities, Available-for-sale		535,000
Subordinated Notes [Member]
Proceeds from Sale of Debt Securities, Available-for-sale		4,500,000
US States and Political Subdivisions Debt Securities [Member]
Payments to Acquire Debt Securities, Available-for-sale			$ 565,000
Available-For-Sale Securities Pledged to Secure Municipal Deposits [Member]
Debt Securities, Available-for-sale, Restricted	$ 60,900,000	$ 60,900,000		$ 6,100,000

X

- Definition

The number of available-for-sale securities held.

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Unrealized holding losses depreciation percentage from amortized cost.

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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).

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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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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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