Consolidated Statements of Cash Flows - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities:
Net income	$ 1,417,540	$ 1,760,305
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based compensation expense	325,872	603,968
Depreciation and amortization expense	552,982	608,990
Provision for doubtful accounts	3,786	57,328
Deferred tax benefit	36
Changes in operating assets and liabilities:
(Increase) decrease in settlement assets	(294,389)	117,192
Increase in accounts receivables, prepaid expenses and other current assets	(890,025)	(493,038)
Decrease in other long-term assets	314,915	124,786
Increase (decrease) in accounts payable and accrued expenses	33,022	(193,076)
Increase (decrease) in due to merchants	264,847	(120,449)
Other	23,894	34,365
Net cash provided by operating activities	1,752,480	2,500,371
Cash flows from investing activities:
(Increase) decrease in restricted cash	(57,731)	2,038
Increase in merchant reserve	(4,369)	(1,990)
Purchase of property and equipment	(83,159)	(60,746)
Capitalized software development	(167,311)	(288,162)
Net cash used in investing activities	(312,570)	(348,860)
Cash flows from financing activities:
Proceeds from issuance of common stock	936,053	772,813
Principal payments on capital lease obligations	(78,110)	(106,528)
Purchase of treasury stock		(3,621,505)
Common stock repurchases for tax withholdings	(25,905)	(22,255)
Net cash provided by (used in) financing activities	832,038	(2,977,475)
Net increase (decrease) in cash and cash equivalents	2,271,948	(825,964)
Cash and cash equivalents at beginning of period	13,305,816	14,675,515
Cash and cash equivalents at end of period	15,577,764	13,849,551
Cash paid for:
Interest	87,825	8,544
Income taxes	295,755	295,589
Non-cash investing and financing activities:
Common stock issued for stock options exercised	419	98
Assets acquired under capital leases	47,067	98,988
Accrued capitalized hardware, software and fixed assets	64,259	30,667
Capitalized stock-based compensation	$ 5,921	$ 6,366