Condensed Consolidated Statements of Operations (Unaudited) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenue
Products sales and leasing	$ 5,557,080	$ 5,809,880	$ 16,003,161	$ 14,822,692
Shipping and installation revenue	946,159	1,456,430	2,769,227	4,257,825
Royalties	403,098	278,146	1,162,148	1,091,518
Total revenue	6,906,337	7,544,456	19,934,536	20,172,035
Cost of goods sold	5,143,337	5,424,602	15,303,534	15,130,188
Gross profit	1,763,000	2,119,854	4,631,002	5,041,847
Operating expenses
General and administrative expenses	711,569	671,514	2,175,631	1,980,329
Selling expenses	518,687	474,913	1,784,748	1,606,609
Total operating expenses	1,230,256	1,146,427	3,960,379	3,586,938
Gain on sale of assets	10,741	31,094	29,247	82,065
Other income (expense)	(58,520)	11,750	(13,039)	14,630
Operating income	484,965	1,016,271	686,831	1,551,604
Interest income (expense)
Interest expense	(39,662)	(33,757)	(98,833)	(101,808)
Interest income	1,606	1,010	3,067	3,890
Total other expense	(38,056)	(32,747)	(95,766)	(97,918)
Income before income tax expense	446,909	983,524	591,065	1,453,686
Income tax expense	175,000	295,000	233,000	469,000
Net income	$ 271,909	$ 688,524	$ 358,065	$ 984,686
Basic earnings per share	$ 0.06	$ 0.14	$ 0.07	$ 0.20
Diluted earnings per share	$ 0.06	$ 0.14	$ 0.07	$ 0.20
Weighted average number of common shares outstanding:
Basic (in shares)	4,841,208	4,826,182	4,834,305	4,826,182
Diluted (in shares)	4,906,073	4,859,097	4,899,170	4,861,777