Long and short-term capital leases (Tables)

12 Months Ended

Dec. 31, 2012

Long and short-term capital leases

Schedule of long and short-term capital leases

	December 31,
	2012			2011
Capital leases to various lessors secured by financed equipment with interest rates ranging from 4.67% to 20.04%. Principal and interest are payable monthly through May 2016	$	701,598		$	495,987
Total long and short-term portions of capital leases	701,598			495,987
Less short-term portion capital leases	(337,588		)	(247,257		)
Long-term portion of capital leases	$	364,010		$	248,730

Schedule of interest expense by term debt component

	Year ended December 31,
	2012		2011		2010
Inter-Atlantic Fund L.P. note payable (non-cash)	$	—	$	—	$	295,743
Capital leases	55,699		64,462		65,257
Total term debt interest expense	$	55,699	$	64,462	$	361,000