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Note M - Certain Relationships and Related Party Transactions (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jan. 30, 2018
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Sale of Stock, Number of Shares Issued in Transaction (in shares) 9,926      
Gain (Loss) on Contract Termination     $ 2,100  
Asset Impairment Charges, Total     2,200  
Wipro [Member]        
Capitalized Computer Software, Additions   $ 0 1,700  
Asset Impairment Charges, Total       $ 900
Accounts Payable, Related Parties   1,500   $ 1,500
Wipro [Member] | Technology-related Services and Lease Expense [Member]        
Related Party Transaction, Expenses from Transactions with Related Party   $ 200 6,300  
Gain (Loss) on Contract Termination     2,100  
Related Party Transaction, Annual Savings from Transactions with Related Party     $ 3,300  
Snap Kitchen [Member] | Harte Hanks [Member]        
Related Party, Ownership Percentage   7.00%    
Securities Purchase Agreement [Member] | Series A Preferred Stock [Member] | Wipro [Member]        
Sale of Stock, Number of Shares Issued in Transaction (in shares) 9,926      
Convertible Preferred Stock, Shares Issued upon Conversion (in shares) 1,001,614      
Convertible Preferred Stock, Shares Issued upon Conversion as Percent of Common Stock Outstanding 16.00%      
Sale of Stock, Consideration Received on Transaction $ 9,900