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Note 9 - Concentrations (Details Textual) - Revenue Benchmark [Member] - Customer Concentration Risk [Member]
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Number of Major Customers   1 1
Concentration Risk, Percentage   5.00% 5.00%
Priority Payment Systems LLC [Member]      
Concentration Risk, Percentage 44.00% 61.00%  
BIN and ICA [Member      
Concentration Risk, Percentage 38.00% 20.00%