| Document And Entity Information | Jan. 23, 2025 |
| Document Information [Line Items] | |
| Entity Tax Identification Number | 74-1677284 |
| Entity Address, Address Line One | 1 Executive Drive, Suite 303 |
| Pre-commencement Issuer Tender Offer | false |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Title of 12(b) Security | Common Stock |
| Trading Symbol | HHS |
| Security Exchange Name | NASDAQ |
| Entity Address, City or Town | Chelmsford |
| Entity Address, State or Province | MA |
| Entity Address, Postal Zip Code | 01824 |
| City Area Code | (512) |
| Entity Registrant Name | Harte Hanks, Inc. |
| Document Type | 8-K |
| Document Period End Date | Jan. 23, 2025 |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 1-7120 |
| Entity Emerging Growth Company | false |
| Amendment Flag | false |
| Entity Central Index Key | 0000045919 |
| Local Phone Number | 434-1100 |
