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Note 9 - Employee Benefits (Details Textual) $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)	Jul. 01, 2021	Mar. 20, 2019	Mar. 29, 2017
Cash Surrender Value of Life Insurance	$ 54,900		$ 54,600
Proceeds from Life Insurance Policy	0	$ 931
Return of Cash Surrender Value of Life Insurance		800
Gain From Bank-owned Life Insurance Claim	(0)	142
Bank Owned Life Insurance Income	349	$ 321
Supplemental Employee Retirement Plan [Member]
Defined Benefit Plan, Number of Individuals					1	5
Defined Benefit Plan, Benefit Obligation	4,500		4,400
Supplemental Employee Retirement Plan [Member] | Landmark Bancorp Inc. [Member]
Defined Benefit Plan, Number of Individuals				1
Officer [Member]
Split Dollar Life Insurance Arrangement, Death Benefit to be Paid to Insured's Beneficiary	54,900		8,800
Split Dollar Life Insurance Arrangement, Death Benefit to be Paid to Company	$ 46,100
Executive Officer [Member]
Number of Individuals with Split Dollar Life Insurance Arrangement	4
Split Dollar Life Insurance Arrangement, Accrued Expense	$ 376		$ 352

X

- Definition

The number of individuals participating in defined benefit plan.

+ References

No definition available.

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X

- Definition

Amount of gain from bank owned life insurance claim.

+ References

No definition available.

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- Definition

The number of individuals with split dollar life insurance.

+ References

No definition available.

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- Definition

Amount of return of cash surrender value of life insurance.

+ References

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- Definition

Amount of accrued expense for split dollar life insurance arrangement.

+ References

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- Definition

Amount of death benefit to be paid to the company under split dollar life insurance arrangement.

+ References

No definition available.

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- Definition

Amount of death benefit to be paid to insured's beneficiary under the split dollar life insurance arrangement.

+ References

No definition available.

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- Definition

Earnings on or other increases in the value of the cash surrender value of bank owned life insurance policies.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(13))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1

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X

- Definition

Carrying amount as of the balance sheet date of amounts which could be received based on the terms of the insurance contract upon surrendering life policies owned by the entity.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(17))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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- Definition

Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

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- Definition

Amount of cash inflow for proceeds from settlement of corporate-owned life insurance policy, classified as investing activities. Includes, but is not limited to, bank-owned life insurance policy.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-12

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 21C
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-21C

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