Condensed Consolidated Statements of Operations (Unaudited) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Revenue
Products sales and leasing	$ 7,155,973	$ 5,600,996	$ 13,389,679	$ 8,869,733
Shipping and installation revenue	2,002,271	813,894	3,494,934	1,413,147
Royalties	481,775	482,675	810,490	814,810
Total revenue	9,640,019	6,897,565	17,695,103	11,097,690
Cost of goods sold	7,571,093	5,229,992	14,348,184	8,900,125
Gross profit	2,068,926	1,667,573	3,346,919	2,197,565
Operating expenses
General and administrative expenses	897,616	746,357	1,731,427	1,621,064
Selling expenses	537,696	514,760	1,128,502	1,018,774
Total operating expenses	1,435,312	1,261,117	2,859,929	2,639,838
Gain on sale of assets	8,175	6,373	14,043	11,627
Other income	10,566	3,949	17,459	14,556
Operating income (loss)	652,355	416,778	518,492	(416,090)
Interest income (expense)
Interest expense	(35,580)	(23,737)	(63,729)	(50,730)
Interest income	21,149	816	30,385	1,308
Total other expense	(14,431)	(22,921)	(33,344)	(49,422)
Income before income tax expense	637,924	393,857	485,148	(465,512)
Income tax expense (benefit)	(219,000)	(149,000)	(156,000)	186,000
Net income (loss)	$ 418,924	$ 244,857	$ 329,148	$ (279,512)
Basic income (loss) per share (in dollars per share)	$ 0.09	$ 0.05	$ 0.07	$ (0.06)
Diluted income (loss) per share (in dollars per share)	$ 0.08	$ 0.05	$ 0.07	$ (0.06)
Weighted average number of common shares outstanding:
Basic (in shares)	4,919,548	4,892,686	4,919,548	4,892,686
Diluted (in shares)	4,967,059	4,938,234	4,970,769	4,892,686