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Reportable Segments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Revenues $ 22,664 $ 18,135 $ 18,062
Operating income 5,040 $ 5,350 $ 4,686
Billing and related services [Member]      
Revenues 16,547    
Operating income 4,254    
Messaging [Member]      
Revenues 6,117    
Operating income $ 786