Condensed Consolidated Statements of Operations (Unaudited) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Revenue
Products sales and leasing	$ 4,070,338	$ 5,859,381
Shipping and installation revenue	1,114,904	706,804
Royalties	452,166	327,450
Total revenue	5,637,408	6,893,635
Cost of goods sold	4,907,402	5,077,872
Gross profit	730,006	1,815,763
Operating expenses
General and administrative expenses	769,071	629,753
Selling expenses	539,480	660,899
Total operating expenses	1,308,551	1,290,652
Gain on sale of assets	11,977	7,157
Other income (expense)	30,077	20,101
Operating income (loss)	(536,491)	552,369
Interest income (expense)
Interest expense	(28,757)	(32,378)
Interest income	5,712	1,080
Total other expense	(23,045)	(31,298)
Income (loss) before income tax expense (benefit)	(559,536)	521,071
Income tax expense (benefit)	(231,000)	212,000
Net income (loss)	$ (328,536)	$ 309,071
Basic earnings (loss) per share	$ (0.07)	$ 0.06
Diluted earnings (loss) per share	$ (0.07)	$ 0.06
Weighted average number of common shares outstanding:
Basic (in shares)	4,881,548	4,826,182
Diluted (in shares)	4,881,548	4,898,348