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Note 8 - Concentrations (Details Textual) - Revenue Benchmark [Member] - Customer Concentration Risk [Member]
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Number of Major Customers 2 2
Concentration Risk, Percentage 5.00% 5.00%
Priority Payment Systems LLC [Member]    
Concentration Risk, Percentage 37.00% 52.00%
BIN and ICA [Member]    
Concentration Risk, Percentage 43.00% 32.00%
First Data Corp [Member]    
Concentration Risk, Percentage 10.00% 7.00%