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Document And Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2023
Mar. 15, 2024
Jun. 30, 2023
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Current Fiscal Year End Date --12-31    
Document Period End Date Dec. 31, 2023    
Document Transition Report false    
Entity File Number 001-07120    
Entity Registrant Name HARTE HANKS, INC.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 74-1677284    
Entity Address, Address Line One 1 Executive Drive    
Entity Address, City or Town Chelmsford    
Entity Address, State or Province MA    
Entity Address, Postal Zip Code 01824    
City Area Code 512    
Local Phone Number 434-1100    
Title of 12(b) Security Common Stock    
Trading Symbol HHS    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 33,654,017
Entity Common Stock, Shares Outstanding   7,240,905  
Documents Incorporated by Reference
Portions of the Proxy Statement to be filed in relation to the Company’s 2024 Annual Meeting of Stockholders are incorporated herein by reference into Part III of this Form 10-K.
    
Entity Central Index Key 0000045919    
Amendment Flag false    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2023