Stock-based compensation expense (Details) shares in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2016 USD ($) $ / shares item shares	Mar. 31, 2016 USD ($) shares	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) $ / shares	Jun. 30, 2015 USD ($)
Stock-based expense
Options granted (in shares) | shares		0.8
Total stock-based compensation expense	$ 576,931		$ 228,128	$ 1,180,899	$ 461,590
Processing and service costs
Stock-based expense
Total stock-based compensation expense	50,255		50,084	99,061	100,581
Selling general and administrative expenses
Stock-based expense
Total stock-based compensation expense	$ 526,676		178,044	1,081,838	361,009
Stock options
Stock-based expense
Fair value of options granted		$ 700,000
Requisite service period	36 months	36 months
Total stock-based compensation expense	$ 267,833		124,433	549,229	255,705
Restricted stock
Stock-based expense
Total stock-based compensation expense	$ 309,098		$ 103,695	631,670	$ 205,885
Restricted stock | Officers
Number of Awards
Awards vested (in shares) | shares	0.5
Restricted stock awards vested (in shares) | shares	0.5
Number of consecutive trading days equal or over $3.50 per share | item	7
Number of trading days equal or over $3.50 per share over a consecutive thirty-five day period | item	10
Number of consecutive days which any ten trading days equal or over $3.50 per share | item	35
Value at market condition				$ 700,000
Restricted stock awards expensed	$ 200,000	$ 500,000
Restricted stock | Officers | Awarded third quarter 2015 expires December 31, 2017
Number of Awards
Minimum volume weighted average price on NASDAQ (per share) | $ / shares	3.50			3.50
Restricted stock | Directors
Stock-based expense
Awards granted (in shares) | shares	0.1
Fair value of awards granted	$ 200,000
Requisite service period	12 months