Segment information - Information about revenue, profit and assets (Detai)	3 Months Ended		6 Months Ended
	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) item	Jun. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)
Segment information
Number of reportable segments | item			2
Cost of sales included in processing and services costs	$ 3,524,123	$ 3,385,658	$ 7,024,791	$ 6,623,598
Long-lived assets	7,100,000		$ 7,100,000		$ 7,400,000
Number of geographical regions in which the entity conducts its business | item			3
Net Revenue:
Net revenue	13,103,376	12,683,359	$ 26,787,889	24,816,129
Gross Profit:
Total gross profit	6,844,564	6,706,816	14,337,185	13,013,442
Income from operations before provision for income taxes:
Total gross profit	6,844,564	6,706,816	14,337,185	13,013,442
Selling, general and administrative expenses	5,204,892	4,712,704	10,685,606	9,183,104
Restructuring charges	125,268		125,268
Income from operations	1,514,404	1,994,112	3,526,311	3,830,338
Interest expense	(83,021)	(13,830)	(97,697)	(28,443)
Interest income	398	365	822	791
Total other expense, net	(82,623)	(13,465)	(96,875)	(27,652)
Income from operations before provision for income taxes	1,431,781	1,980,647	3,429,436	3,802,686
Operating segments
Gross Profit:
Total gross profit	9,745,551	9,405,479	19,998,418	18,337,274
Income from operations before provision for income taxes:
Total gross profit	9,745,551	9,405,479	19,998,418	18,337,274
Corporate allocated cost of sales
Gross Profit:
Total gross profit	2,900,987	2,698,663	5,661,233	5,323,832
Income from operations before provision for income taxes:
Total gross profit	2,900,987	2,698,663	5,661,233	5,323,832
Multi-currency processing services
Segment information
Cost of sales included in processing and services costs	600,000	700,000	1,400,000	1,300,000
Net Revenue:
Net revenue	7,958,606	8,061,689	16,592,838	15,743,454
Multi-currency processing services | Operating segments
Gross Profit:
Total gross profit	7,335,470	7,374,695	15,229,280	14,443,689
Income from operations before provision for income taxes:
Total gross profit	7,335,470	7,374,695	15,229,280	14,443,689
Payment processing services
Net Revenue:
Net revenue	5,144,770	4,621,670	10,195,051	9,072,675
Payment processing services | Operating segments
Gross Profit:
Total gross profit	2,410,081	2,030,784	4,769,138	3,893,585
Income from operations before provision for income taxes:
Total gross profit	2,410,081	2,030,784	4,769,138	3,893,585
APAC
Net Revenue:
Net revenue	3,761,918	4,226,769	7,578,982	8,263,045
APAC | Multi-currency processing services | Operating segments
Gross Profit:
Total gross profit	3,731,646	4,187,113	7,525,150	8,193,825
Income from operations before provision for income taxes:
Total gross profit	3,731,646	4,187,113	7,525,150	8,193,825
Americas
Net Revenue:
Net revenue	2,444,187	1,750,920	4,629,561	3,244,050
Americas | Multi-currency processing services | Operating segments
Gross Profit:
Total gross profit	2,261,907	1,641,963	4,296,595	3,038,241
Income from operations before provision for income taxes:
Total gross profit	2,261,907	1,641,963	4,296,595	3,038,241
EMEA
Net Revenue:
Net revenue	1,752,501	2,084,000	4,384,295	4,236,359
EMEA | Multi-currency processing services | Operating segments
Gross Profit:
Total gross profit	1,341,917	1,545,619	3,407,535	3,211,623
Income from operations before provision for income taxes:
Total gross profit	$ 1,341,917	$ 1,545,619	$ 3,407,535	$ 3,211,623