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Note 3 - Available-for-sale Securities (Details Textual)	3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions	45		45		32
Number of Available-for-sale Securities	47		47		39
Unrealized Holding Losses Depreciation Percentage from Amortized Cost	20.20%		20.20%		2.70%
Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale, Total			$ 0
Payments to Acquire Debt Securities, Available-for-Sale			19,329,000	$ 136,134,000
Proceeds from Sale of Debt Securities, Available-for-Sale	$ 0		0
Debt Securities, Available-for-Sale, Realized Gain (Loss), Total		$ 26,000	(0)	119,000
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]
Payments to Acquire Debt Securities, Available-for-Sale			11,800,000	112,000,000.0
Proceeds from Sale of Debt Securities, Available-for-Sale				32,400,000
Corporate Debt Securities [Member]
Payments to Acquire Debt Securities, Available-for-Sale			2,000,000.0	18,200,000
Proceeds from Sale of Debt Securities, Available-for-Sale				16,300,000
Subordinated Notes [Member]
Payments to Acquire Debt Securities, Available-for-Sale			4,000,000.0
Proceeds from Sale of Debt Securities, Available-for-Sale				4,500,000
SBA Loan Pools [Member]
Payments to Acquire Debt Securities, Available-for-Sale			1,500,000	5,900,000
Proceeds from Sale of Debt Securities, Available-for-Sale				$ 535,000
Asset Pledged as Collateral [Member] | Federal Home Loan Bank Advances [Member]
Debt Securities, Available-for-Sale, Restricted	$ 28,300,000		$ 28,300,000		$ 36,600,000

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The number of available-for-sale securities held.

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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).

+ References

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-Publisher FASB
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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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