Document And Entity Information - shares	6 Months Ended
	Jun. 30, 2022	Jul. 15, 2022
Document Information [Line Items]
Entity Central Index Key	0000045919
Entity Registrant Name	HARTE HANKS INC
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	Q2
Document Fiscal Year Focus	2022
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2022
Document Transition Report	false
Entity File Number	001-07120
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	74-1677284
Entity Address, Address Line One	2 Executive Drive, Suite 103
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 Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		7,032,528