Segment information (Details) (USD $)	3 Months Ended
	Mar. 31, 2013 item	Mar. 31, 2012	Dec. 31, 2012
Segment information
Number of reportable segments	2
Segment information
Cost of sales included in processing and services costs	$ 3,175,647	$ 2,730,829
Long-lived assets	10,100,000		9,800,000
Number of geographical regions in which the entity conducts its business	3
Net Revenue:
Net revenue	12,086,063	11,680,936
Gross Profit:
Total gross profit	8,842,269	8,897,345
Multi-currency processing services
Segment information
Cost of sales included in processing and services costs	400,000
Net Revenue:
Net revenue	7,830,729	7,522,625
Gross Profit:
Total gross profit	7,389,224	7,522,625
Payment processing services
Net Revenue:
Net revenue	4,255,334	4,158,311
Number of individual merchants with revenue greater than 10% of segment revenue	0
Gross Profit:
Total gross profit	1,453,045	1,374,720
APAC | Multi-currency processing services
Net Revenue:
Net revenue	3,716,672	4,189,768
Gross Profit:
Total gross profit	3,684,004	4,189,768
North America | Multi-currency processing services
Net Revenue:
Net revenue	1,461,101	969,585
Gross Profit:
Total gross profit	1,436,166	969,585
CEMEA | Multi-currency processing services
Net Revenue:
Net revenue	2,652,956	2,363,272
Gross Profit:
Total gross profit	$ 2,269,054	$ 2,363,272