Segment information (Details) (USD $)	12 Months Ended
	Dec. 31, 2013 item	Dec. 31, 2012	Dec. 31, 2011
Segment information
Number of reportable segments	2
Segment information
Processing and service costs	$ 13,048,294	$ 11,010,778	$ 9,093,674
Long-lived assets	10,300,000	9,800,000
Number of geographical regions in which the entity conducts its business	3
Net Revenue:
Net revenue	46,566,065	43,578,016	41,858,166
Gross Profit:
Total gross profit	33,650,276	32,634,726	30,181,154
Multi-currency processing services
Segment information
Processing and service costs	1,700,000
Net Revenue:
Net revenue	29,813,449	28,807,090	27,238,762
Gross Profit:
Total gross profit	28,133,922	28,807,090	27,238,762
Payment processing services
Net Revenue:
Net revenue	16,752,616	14,770,926	14,619,404
Number of individual merchants with revenue greater than 10% of segment revenue	0
Gross Profit:
Total gross profit	5,516,354	3,827,636	2,942,392
APAC
Net Revenue:
Net revenue	15,666,192	16,248,880	18,337,513
Gross Profit:
Total gross profit	15,572,813	16,248,880	18,337,513
North America
Net Revenue:
Net revenue	6,165,431	5,000,064	3,991,374
Gross Profit:
Total gross profit	6,045,441	5,000,064	3,991,374
CEMEA
Net Revenue:
Net revenue	7,981,826	7,558,146	4,909,875
Gross Profit:
Total gross profit	$ 6,515,668	$ 7,558,146	$ 4,909,875