Condensed Consolidated Statements of Operations (Unaudited) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Revenue
Products sales and leasing	$ 4,666,367	$ 4,586,700	$ 8,736,705	$ 10,446,081
Shipping and installation revenue	1,393,336	1,116,264	2,508,240	1,823,068
Royalties	368,613	431,600	820,779	759,050
Total revenue	6,428,316	6,134,564	12,065,724	13,028,199
Cost of goods sold	5,022,910	5,082,325	9,930,312	10,160,197
Gross profit	1,405,406	1,052,239	2,135,412	2,868,002
Operating expenses
General and administrative expenses	806,931	834,309	1,576,002	1,464,062
Selling expenses	546,889	605,162	1,086,369	1,266,061
Total operating expenses	1,353,820	1,439,471	2,662,371	2,730,123
Gain on sale of assets	22,102	11,349	34,079	18,506
Other income	22,596	25,380	52,673	45,481
Operating income (loss)	96,284	(350,503)	(440,207)	201,866
Interest income (expense)
Interest expense	(29,847)	(26,793)	(58,604)	(59,171)
Interest income	1,544	381	7,256	1,461
Total other expense	(28,303)	(26,412)	(51,348)	(57,710)
Income (loss) before income tax expense (benefit)	67,981	(376,915)	(491,555)	144,156
Income tax expense (benefit)	38,000	(154,000)	(193,000)	58,000
Net income (loss)	$ 29,981	$ (222,915)	$ (298,555)	$ 86,156
Basic earnings (loss) per share (in dollars per share)	$ 0.01	$ (0.05)	$ (0.06)	$ 0.02
Diluted earnings (loss) per share (in dollars per share)	$ 0.01	$ (0.05)	$ (0.06)	$ 0.02
Weighted average number of common shares outstanding:
Basic (in shares)	4,881,548	4,829,380	4,881,548	4,827,790
Diluted (in shares)	4,928,652	4,829,380	4,881,548	4,890,848