Consolidated Statements of Operations (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Revenue
Products sales and leasing	$ 18,353,442	$ 21,190,068
Shipping and installation revenue	5,179,446	4,151,018
Royalties	1,360,725	1,355,641
Total revenue	24,893,613	26,696,727
Cost of goods sold	19,447,119	22,094,943
Gross profit	5,446,494	4,601,784
General and administrative expenses	2,662,862	2,868,441
Selling expenses	2,205,043	2,342,997
Total operating expenses	4,867,905	5,211,438
Gain on sale of assets	110,175	81,376
Other	(1,002)	163,442
Operating income (loss)	687,762	(364,836)
Other income (expense)
Interest expense	(134,828)	(136,067)
Interest income	5,757	13,223
Total other expense	(129,071)	(122,844)
Income (loss) before income tax expense (benefit)	558,691	(487,680)
Income tax expense (benefit)	(182,000)	136,000
Net income (loss)	$ 376,691	$ (351,680)
Basic earnings (loss) per share (in dollars per share)	$ 0.08	$ (0.07)
Diluted earnings (loss) per share (in dollars per share)	$ 0.08	$ (0.07)