Segment Data (Details) (USD $)	3 Months Ended			9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011 Segment	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Summary of operational information relative to the company's reportable segments
Product sales	$ 28,772,956		$ 24,383,110	$ 82,636,791	$ 68,698,115
Service revenue	159,429		96,092	397,604	251,983
Net sales	28,772,956		24,383,110	82,636,791	68,698,115
Cost of products sold	11,969,944		11,279,502	34,090,148	31,145,151
Cost of services delivered	1,114,668		1,149,075	3,308,794	3,503,057
Gross margin	16,803,012		13,103,608	48,546,643	37,552,964
Litigation judgment (recovery) expense				(2,200,000)	3,301,243
Income (loss) from operations	5,277,315		1,212,092	17,791,263	(3,694,266)
Purchases of property and equipment	285,307		511,321	887,609	1,171,193
Purchases of intangible assets	85,876		97,225	337,863	310,501
Depreciation and amortization	1,718,546		1,995,032	5,113,989	6,112,612
Segment Data (Textual) [Abstract]
Number of reportable segment of company		2
ECD [Member]
Summary of operational information relative to the company's reportable segments
Product sales	27,085,180		23,361,182	78,774,581	66,025,172
Net sales	27,085,180		23,361,182	78,774,581	66,025,172
Cost of products sold	9,673,370		9,437,149	28,068,676	25,686,372
Gross margin	17,411,810		13,924,033	50,705,905	40,338,800
Litigation judgment (recovery) expense				(2,200,000)	3,301,243
Income (loss) from operations	7,749,953		3,958,042	25,726,461	5,495,271
Purchases of property and equipment	217,092		416,740	530,383	1,056,081
Purchases of intangible assets	76,148		95,800	322,337	307,386
Depreciation and amortization	1,054,239		1,331,505	3,336,403	4,135,042
Video [Member]
Summary of operational information relative to the company's reportable segments
Product sales	1,528,347		925,836	3,464,606	2,420,960
Service revenue	159,429		96,092	397,604	251,983
Net sales	1,687,776		1,021,928	3,862,210	2,672,943
Cost of products sold	1,181,906		693,278	2,712,678	1,955,722
Cost of services delivered	1,114,668		1,149,075	3,308,794	3,503,057
Gross margin	(608,798)		(820,425)	(2,159,262)	(2,785,836)
Income (loss) from operations	(2,472,638)		(2,745,950)	(7,935,198)	(9,189,537)
Purchases of property and equipment	68,215		94,581	357,226	115,112
Purchases of intangible assets	9,728		1,425	15,526	3,115
Depreciation and amortization	$ 664,307		$ 663,527	$ 1,777,586	$ 1,977,570