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Note C - Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Total Revenues $ 49,259 $ 41,601 $ 93,013 $ 82,123
Marketing Services [Member]        
Total Revenues 14,208 12,965 27,086 26,465
Customer Care [Member]        
Total Revenues 19,191 15,227 35,735 23,707
Fulfillment and Logistics Services [Member]        
Total Revenues 15,860 13,409 30,192 31,951
Transferred over Time [Member]        
Total Revenues 45,159 38,325 85,597 75,088
Transferred over Time [Member] | Marketing Services [Member]        
Total Revenues 12,087 12,147 23,535 24,926
Transferred over Time [Member] | Customer Care [Member]        
Total Revenues 19,191 15,227 35,735 23,707
Transferred over Time [Member] | Fulfillment and Logistics Services [Member]        
Total Revenues 13,881 10,951 26,327 26,455
Transferred at Point in Time [Member]        
Total Revenues 4,100 3,276 7,416 7,035
Transferred at Point in Time [Member] | Marketing Services [Member]        
Total Revenues 2,121 818 3,551 1,539
Transferred at Point in Time [Member] | Customer Care [Member]        
Total Revenues 0 0 0 0
Transferred at Point in Time [Member] | Fulfillment and Logistics Services [Member]        
Total Revenues $ 1,979 $ 2,458 $ 3,865 $ 5,496