Condensed Consolidated Statements of Operations (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Revenue
Products sales and leasing	$ 5,467,610	$ 6,543,501	$ 11,538,969	$ 12,026,370
Shipping and installation revenue	1,339,933	694,134	2,552,815	1,119,340
Royalties	337,515	453,932	668,661	897,876
Total revenue	7,145,058	7,691,567	14,760,445	14,043,586
Cost of goods sold	5,392,727	5,563,403	11,414,166	9,930,945
Gross profit	1,752,331	2,128,164	3,346,279	4,112,641
Operating expenses
General and administrative expenses	725,660	641,434	1,491,683	1,223,758
Selling expenses	634,282	613,719	1,194,588	1,181,500
Total operating expenses	1,359,942	1,255,153	2,686,271	2,405,258
Operating income	392,389	873,011	660,008	1,707,383
Other income (expense)
Interest expense	(37,544)	(46,051)	(72,322)	(88,499)
Interest income	3,701	4,161	8,874	16,531
Gain on sale of assets	17,317	1,539	20,154	4,667
Other, net	23,681	(472)	73,722	(629)
Total other income (expense)	7,155	(40,823)	30,428	(67,930)
Income before income tax expense	399,544	832,188	690,436	1,639,453
Income tax expense	145,000	320,993	248,000	628,000
Net income	$ 254,544	$ 511,195	$ 442,436	$ 1,011,453
Basic earnings per share	$ 0.05	$ 0.11	$ 0.09	$ 0.22
Diluted earnings per share	$ 0.05	$ 0.11	$ 0.09	$ 0.21
Weighted average number of common shares outstanding:
Basic	4,796,649	4,702,882	4,750,674	4,702,882
Diluted	4,884,769	4,786,812	4,839,510	4,807,240