Document And Entity Information - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2022
Sep. 24, 2022
Dec. 31, 2021
Document Information Line Items      
Trading Symbol KFFB    
Document Type 10-K    
Current Fiscal Year End Date --06-30    
Entity Common Stock, Shares Outstanding   8,154,695  
Entity Public Float     $ 19.2
Amendment Flag false    
Entity Central Index Key 0001297341    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Non-accelerated Filer    
Entity Well-known Seasoned Issuer No    
Document Period End Date Jun. 30, 2022    
Document Fiscal Year Focus 2022    
Document Fiscal Period Focus FY    
Entity Small Business true    
Entity Emerging Growth Company false    
Entity Shell Company false    
ICFR Auditor Attestation Flag false    
Document Annual Report true    
Document Transition Report false    
Entity File Number 0-51176    
Entity Incorporation, State or Country Code X1    
Entity Tax Identification Number 61-1484858    
Entity Address, Address Line One 655 Main Street    
Entity Address, City or Town Hazard    
Entity Address, State or Province KY    
Entity Address, Postal Zip Code 41702    
City Area Code (502)    
Local Phone Number 223-1638    
Title of 12(b) Security Common Stock, $0.01 par value per share    
Security Exchange Name NASDAQ    
Entity Interactive Data Current Yes    
Auditor Name FORVIS, LLP    
Auditor Location Louisville, KY    
Auditor Firm ID 686