Condensed Consolidated Statements of Operations (Unaudited) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Revenue
Products sales and leasing	$ 4,586,700	$ 4,948,697	$ 10,446,081	$ 9,012,812
Shipping and installation revenue	1,116,264	1,258,657	1,823,068	2,801,395
Royalties	431,600	429,801	759,050	813,372
Total revenue	6,134,564	6,637,155	13,028,199	12,627,579
Cost of goods sold	5,082,325	4,720,545	10,160,197	9,750,349
Gross profit	1,052,239	1,916,610	2,868,002	2,877,230
Operating expenses
General and administrative expenses	834,309	661,019	1,464,062	1,264,052
Selling expenses	605,162	514,590	1,266,061	1,131,696
Total operating expenses	1,439,471	1,175,609	2,730,123	2,395,748
Gain (loss) on sale of assets	11,349	(7,284)	18,506	50,971
Other	25,380	(6,912)	45,481	2,880
Operating income (loss)	(350,503)	726,805	201,866	535,333
Other income (expense)
Interest expense	(26,793)	(32,800)	(59,171)	(68,051)
Interest income	381	1,532	1,461	2,880
Total other expense	(26,412)	(31,268)	(57,710)	(65,171)
Income (loss) before income tax expense	(376,915)	695,537	144,156	470,162
Income tax (benefit) expense	(154,000)	272,000	58,000	174,000
Net income (loss)	$ (222,915)	$ 423,537	$ 86,156	$ 296,162
Basic earnings (loss) per share	$ (0.05)	$ 0.09	$ 0.02	$ 0.06
Diluted earnings (loss) per share	$ (0.05)	$ 0.09	$ 0.02	$ 0.06
Weighted average number of common shares outstanding:
Basic (in shares)	4,829,380	4,826,182	4,827,790	4,826,182
Diluted (in shares)	4,829,380	4,850,569	4,890,848	4,863,208