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Note M - Certain Relationships and Related Party Transactions (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Jan. 30, 2018
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Wipro [Member]            
Accounts Payable, Related Parties   $ 0   $ 0   $ 1,500,000
Accounts Receivable, Related Parties   0   0   $ 0
Wipro [Member] | Technology-related Services and Lease Expense [Member]            
Related Party Transaction, Expenses from Transactions with Related Party     $ 2,600,000   $ 9,500,000  
Wipro [Member] | Service [Member]            
Revenue from Related Parties   $ 0   0    
Snap Kitchen [Member]            
Revenue from Related Parties       $ 164,000    
Snap Kitchen [Member] | Harte Hanks [Member]            
Related Party, Ownership Percentage     9.00%   9.00%  
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 $ 9,900,000