Note 10 - Employee Benefits (Details Textual) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)	Jul. 01, 2021 USD ($)	Jan. 31, 2021	Mar. 31, 2019	Mar. 20, 2019	Dec. 31, 2017	Mar. 29, 2017
Life Insurance, Corporate or Bank Owned, Additional Amount					$ 7,200
Cash Surrender Value of Life Insurance	$ 53,400		$ 53,400		52,700
Bank Owned Life Insurance Income	319	$ 276	638	$ 573
Split Dollar Life Insurance Arrangement, Accrued Expense	235		235		200
Supplemental Employee Retirement Plan [Member]
Defined Benefit Plan, Number of Individuals									1		5
Defined Benefit Plan, Benefit Obligation, Ending Balance	3,800		3,800		$ 3,600
Supplemental Employee Retirement Plan [Member] | Landmark Bancorp Inc. [Member]
Defined Benefit Plan, Benefit Obligation, Ending Balance						$ 1,000
Officer [Member]
Number of Individuals with Split Dollar Life Insurance Arrangement							15	1		11
Split Dollar Life Insurance Arrangement, Death Benefit	53,400		53,400
Split Dollar Life Insurance Arrangement, Death Benefit to be Paid to Insured's Beneficiary	7,800		7,800
Split Dollar Life Insurance Arrangement, Death Benefit to be Paid to Company	$ 45,600		$ 45,600
Executive Officer [Member]
Number of Individuals with Split Dollar Life Insurance Arrangement	4		4