Condensed Consolidated Statements of Operations (Unaudited) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenue
Products sales and leasing	$ 7,913,366	$ 7,155,973	$ 15,383,664	$ 13,389,679
Shipping and installation revenue	2,341,985	2,002,271	3,937,503	3,494,934
Royalties	472,702	481,775	904,128	810,490
Total revenue	10,728,053	9,640,019	20,225,295	17,695,103
Cost of goods sold	7,850,822	7,571,093	14,031,776	14,348,184
Gross profit	2,877,231	2,068,926	6,193,519	3,346,919
Operating expenses
General and administrative expenses	1,132,689	897,616	2,482,734	1,731,427
Selling expenses	651,046	537,696	1,260,850	1,128,502
Total operating expenses	1,783,735	1,435,312	3,743,584	2,859,929
Operating income (loss)	1,093,496	633,614	2,449,935	486,990
Interest income (expense)
Interest expense	(44,712)	(35,580)	(91,139)	(63,729)
Interest income	9,262	21,149	18,889	30,385
Gain on sale of assets	3,807	8,175	16,518	14,043
Other income	12,800	10,566	23,651	17,459
Total other expense	(18,843)	4,310	(32,081)	(1,842)
Income before income tax expense	1,074,653	637,924	2,417,854	485,148
Income tax expense (benefit)	363,000	219,000	849,000	156,000
Net income (loss)	$ 711,653	$ 418,924	$ 1,568,854	$ 329,148
Basic and diluted earnings per share (in dollars per share)	$ 0.14	$ 0.09
Weighted average number of common shares outstanding:
Basic (in shares)	5,044,752	4,919,548	5,026,929	4,919,548
Diluted (in shares)	5,094,536	4,967,059	5,065,611	4,970,769