Condensed Consolidated Statements of Operations (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Revenue
Products sales and leasing	$ 5,859,381	$ 4,064,115
Shipping and installation revenue	706,804	1,542,738
Royalties	327,450	383,571
Total revenue	6,893,635	5,990,424
Cost of goods sold	5,077,872	4,974,567
Gross profit	1,815,763	1,015,857
Operating expenses
General and administrative expenses	629,753	658,270
Selling expenses	660,899	617,106
Total operating expenses	1,290,652	1,275,376
Gain on sale of assets	7,157	58,255
Other	20,101	9,792
Operating income (loss)	552,369	(191,472)
Other income (expense)
Interest expense	(32,378)	(35,251)
Interest income	1,080	1,348
Total other expense	(31,298)	(33,903)
Income (loss) before income tax expense	521,071	(225,375)
Income tax (benefit) expense	212,000	(98,000)
Net income (loss)	$ 309,071	$ (127,375)
Basic earnings (loss) per share	$ 0.06	$ (0.03)
Diluted earnings per share	$ 0.06	$ (0.03)
Weighted average number of common shares outstanding:
Basic	4,826,182	4,826,182
Diluted	4,898,348	4,826,182