Segment Data (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Summary of operational information relative to the company's reportable segments
Product sales	$ 30,182,678	$ 25,529,805
Service revenue	250,974	111,587
Net sales	30,433,652	25,641,392
Cost of products sold	11,404,513	9,405,267
Cost of services delivered	578,135	994,866
Gross margin	18,451,004	15,241,259
Sales, general & administrative	11,210,900	8,854,022
Research & development	2,012,556	2,132,220
Litigation judgment		(2,200,000)
Gain on write down / disposal of property and equipment, net	(28,960)
Income (loss) from operations	5,256,508	6,455,017
Purchases of property and equipment	383,089	277,267
Purchases of intangible assets	103,513	122,541
Depreciation and amortization	1,418,759	1,666,510
CEW [Member]
Summary of operational information relative to the company's reportable segments
Product sales	28,002,622	24,757,674
Net sales	28,002,622	24,757,674
Cost of products sold	10,216,667	8,611,419
Gross margin	17,785,955	16,146,255
Sales, general & administrative	10,102,625	8,086,497
Research & development	988,681	840,352
Litigation judgment		(2,200,000)
Gain on write down / disposal of property and equipment, net	(28,960)
Income (loss) from operations	6,723,609	9,419,406
Purchases of property and equipment	253,833	108,981
Purchases of intangible assets	103,513	122,541
Depreciation and amortization	998,948	1,193,616
Video [Member]
Summary of operational information relative to the company's reportable segments
Product sales	2,180,056	772,131
Service revenue	250,974	111,587
Net sales	2,431,030	883,718
Cost of products sold	1,187,846	793,848
Cost of services delivered	578,135	994,866
Gross margin	665,049	(904,996)
Sales, general & administrative	1,108,275	767,525
Research & development	1,023,875	1,291,868
Litigation judgment
Gain on write down / disposal of property and equipment, net
Income (loss) from operations	(1,467,101)	(2,964,389)
Purchases of property and equipment	129,256	168,286
Depreciation and amortization	$ 419,811	$ 472,894