Inventories (Tables)

3 Months Ended

Mar. 31, 2013

Inventory Disclosure [Abstract]

Inventories of Continuing Operations

Inventories

Inventories of continuing operations consist of the following:

	December 31, 2012			March 31, 2013
Materials and parts	$	4,574,922		$	4,760,273
Work-in-process	—			281,424
Finished goods	1,171,429			912,426
	5,746,351			5,954,123
Less: provision for obsolescence	(3,359,764		)	(3,497,962		)
Inventories, net	$	2,386,587		$	2,456,161