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Note 9 - Employee Benefits (Details Textual)
$ in Thousands
3 Months Ended
Mar. 31, 2023
USD ($)
Mar. 31, 2022
USD ($)
Dec. 31, 2022
USD ($)
Sep. 30, 2022
Jul. 01, 2021
Jan. 31, 2021
Mar. 31, 2019
Mar. 20, 2019
Dec. 31, 2017
Mar. 29, 2017
Cash Surrender Value of Life Insurance $ 53,600   $ 54,000              
Proceeds from Life Insurance Policy 931 $ 0                
Return of Cash Surrender Value of Life Insurance 800                  
Gain From Bank-owned Life Insurance Claim 142 (0)                
Bank Owned Life Insurance Income 321 $ 319                
Supplemental Employee Retirement Plan [Member]                    
Defined Benefit Plan, Number of Individuals               1   5
Defined Benefit Plan, Benefit Obligation 4,100   4,000              
Supplemental Employee Retirement Plan [Member] | Landmark Bancorp Inc. [Member]                    
Defined Benefit Plan, Number of Individuals         1          
Officer [Member]                    
Number of Individuals with Split Dollar Life Insurance Arrangement           15 1   11  
Split Dollar Life Insurance Arrangement, Death Benefit 53,600                  
Split Dollar Life Insurance Arrangement, Death Benefit to be Paid to Insured's Beneficiary 8,800                  
Split Dollar Life Insurance Arrangement, Death Benefit to be Paid to Company $ 44,800                  
Executive Officer [Member]                    
Number of Individuals with Split Dollar Life Insurance Arrangement 4     4            
Split Dollar Life Insurance Arrangement, Accrued Expense $ 289   $ 269