Condensed Consolidated Statements of Operations (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Revenue
Products sales and leasing	$ 4,948,697	$ 5,467,610	$ 9,012,812	$ 11,538,969
Shipping and installation revenue	1,258,657	1,339,933	2,801,395	2,552,815
Royalties	429,801	337,515	813,372	668,661
Total revenue	6,637,155	7,145,058	12,627,579	14,760,445
Cost of goods sold	4,831,019	5,392,727	9,805,586	11,414,166
Gross profit	1,806,136	1,752,331	2,821,993	3,346,279
Operating expenses
General and administrative expenses	550,545	725,660	1,208,815	1,491,683
Selling expenses	514,590	634,282	1,131,696	1,194,588
Total operating expenses	1,065,135	1,359,942	2,340,511	2,686,271
Gain (Loss) on Sale of Property Plant Equipment	(7,284)	17,317	50,971	20,154
Other	(6,912)	23,681	2,880	73,722
Operating income (loss)	726,805	433,387	535,333	753,884
Other income (expense)
Interest expense	(32,800)	(37,544)	(68,051)	(72,322)
Interest income	1,532	3,701	2,880	8,874
Total other income (expense)	(31,268)	(33,843)	(65,171)	(63,448)
Income (loss) before income tax expense	695,537	399,544	470,162	690,436
Income tax benefit (expense)	272,000	145,000	174,000	248,000
Net income (loss)	$ 423,537	$ 254,544	$ 296,162	$ 442,436
Basic earnings (loss) per share	$ 0.09	$ 0.05	$ 0.06	$ 0.09
Diluted earnings per share	$ 0.09	$ 0.05	$ 0.06	$ 0.09
Weighted average number of common shares outstanding:
Basic	4,826,182	4,796,649	4,826,182	4,750,674
Diluted	4,850,569	4,884,769	4,863,208	4,839,510