Consolidated Statements of Income - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Revenue
Products sales and leasing	$ 23,855,724	$ 16,609,047
Shipping and installation revenue	3,606,205	4,269,157
Royalties	1,742,310	1,592,633
Total revenue	29,204,239	22,470,837
Cost of goods sold	22,093,834	18,625,035
Gross profit	7,110,405	3,845,802
General and administrative expenses	3,365,513	2,979,835
Selling expenses	2,168,013	2,218,269
Total operating expenses	5,533,526	5,198,104
Gain on sale of assets	17,381	(174)
Other	74,410	157,540
Operating income	1,668,670	(1,194,936)
Other income (expense)
Interest expense	(103,086)	(116,229)
Interest income	35,720	8,327
Total other expense	(67,366)	(107,902)
Income before income tax expense	1,601,304	(1,302,838)
Income tax expense	557,000	(498,000)
Net income	$ 1,044,304	$ (804,838)
Basic earnings per share (in dollars per share)	$ 0.21	$ (0.16)
Diluted earnings per share (in dollars per share)	$ 0.21	$ (0.16)