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Note 7 - Loans and Related Allowance for Credit Losses - Troubled Debt Restructurings (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Modified, Amortized cost	$ 19,582	$ 17,517
to Total Financing Receivables, Percentage	1.30%	1.30%
Modified, Amortized cost	$ 19,582	$ 17,517
Payment Deferral [Member]
Modified, Amortized cost	0	0
Modified, Amortized cost	0	0
Extended Maturity [Member]
Modified, Amortized cost	17,075	15,010
Modified, Amortized cost	17,075	15,010
Payment Deferral and Extended Maturity [Member]
Modified, Amortized cost	2,507	2,507
Modified, Amortized cost	2,507	2,507
Interest Rate Reduction and Term Past Due [Member]
Modified, Amortized cost	0	0
Modified, Amortized cost	0	0
Interest Rate Reduction and Principal Forgiveness [Member]
Modified, Amortized cost	0	0
Modified, Amortized cost	0	0
Commercial Portfolio Segment [Member] | Payment Deferral and Extended Maturity [Member]
Modified, Amortized cost		2,507
Modified, Amortized cost		2,507
Commercial Portfolio Segment [Member] | Non-owner occupied Loan [Member]
Modified, Amortized cost	$ 17,361	$ 17,431
to Total Financing Receivables, Percentage	1.20%	1.30%
Modified, Amortized cost	$ 17,361	$ 17,431
Commercial Portfolio Segment [Member] | Non-owner occupied Loan [Member] | Payment Deferral [Member]
Modified, Amortized cost	0	0
Modified, Amortized cost	0	0
Commercial Portfolio Segment [Member] | Non-owner occupied Loan [Member] | Extended Maturity [Member]
Modified, Amortized cost	14,854	14,924
Modified, Amortized cost	14,854	14,924
Commercial Portfolio Segment [Member] | Non-owner occupied Loan [Member] | Payment Deferral and Extended Maturity [Member]
Modified, Amortized cost	2,507
Modified, Amortized cost	2,507
Commercial Portfolio Segment [Member] | Non-owner occupied Loan [Member] | Interest Rate Reduction and Term Past Due [Member]
Modified, Amortized cost	0	0
Modified, Amortized cost	0	0
Commercial Portfolio Segment [Member] | Non-owner occupied Loan [Member] | Interest Rate Reduction and Principal Forgiveness [Member]
Modified, Amortized cost	0	0
Modified, Amortized cost	0	0
Construction and Other [Member]
Modified, Amortized cost	$ 2,221
to Total Financing Receivables, Percentage	0.10%
Modified, Amortized cost	$ 2,221
Construction and Other [Member] | Payment Deferral [Member]
Modified, Amortized cost	0
Modified, Amortized cost	0
Construction and Other [Member] | Extended Maturity [Member]
Modified, Amortized cost	2,221
Modified, Amortized cost	2,221
Construction and Other [Member] | Payment Deferral and Extended Maturity [Member]
Modified, Amortized cost	0
Modified, Amortized cost	0
Construction and Other [Member] | Interest Rate Reduction and Term Past Due [Member]
Modified, Amortized cost	0
Modified, Amortized cost	0
Construction and Other [Member] | Interest Rate Reduction and Principal Forgiveness [Member]
Modified, Amortized cost	0
Modified, Amortized cost	$ 0
Commercial And Industrial [Member]
Modified, Amortized cost		$ 86
to Total Financing Receivables, Percentage		0.00%
Modified, Amortized cost		$ 86
Commercial And Industrial [Member] | Payment Deferral [Member]
Modified, Amortized cost		0
Modified, Amortized cost		0
Commercial And Industrial [Member] | Extended Maturity [Member]
Modified, Amortized cost		86
Modified, Amortized cost		86
Commercial And Industrial [Member] | Payment Deferral and Extended Maturity [Member]
Modified, Amortized cost		0
Modified, Amortized cost		0
Commercial And Industrial [Member] | Interest Rate Reduction and Term Past Due [Member]
Modified, Amortized cost		0
Modified, Amortized cost		0
Commercial And Industrial [Member] | Interest Rate Reduction and Principal Forgiveness [Member]
Modified, Amortized cost		0
Modified, Amortized cost		$ 0

X

- Definition

Percentage of financing receivable modified during period for debtor experiencing financial difficulty to total financing receivables.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 12A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481933/310-10-55-12A

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-42

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- Definition

Amortized cost of financing receivable modified during period for debtor experiencing financial difficulty.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 33
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-33

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 310
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-Section 55
-Paragraph 12A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481933/310-10-55-12A

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
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-Paragraph 42
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-Publisher FASB
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