STOCKHOLDERS' EQUITY (Details) (USD $)	12 Months Ended										1 Months Ended	12 Months Ended		1 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 0.83-2.00 [Member]	Dec. 31, 2012 4.00-6.00 [Member]	Dec. 31, 2012 13.00-16.00 [Member]	Dec. 31, 2012 17.00-18.99 [Member]	Dec. 31, 2012 19.00-21.00 [Member]	Dec. 31, 2012 26.00-28.00 [Member]	Dec. 31, 2012 29.00-31.00 [Member]	Jul. 31, 2007 1997 Stock Option Plan [Member]	Dec. 31, 2012 1997 Stock Option Plan [Member]	Dec. 31, 2012 1997 Stock Option Plan [Member] Qualified Incentive Stock Options [Member]	Dec. 31, 2003 2001 Stock Option Plan [Member]	Dec. 31, 2012 2001 Stock Option Plan [Member]	Dec. 16, 2003 2001 Stock Option Plan [Member]	Aug. 31, 2001 2001 Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for issuance (in shares)												500,000			2,050,000	1,750,000	750,000
Exercise price per share of common stock (in hundredths)												100.00%	110.00%
Minimum ownership percentage for qualified incentive stock options (in hundredths)													10.00%
Number of installments for options vest and become exercisable												4
Options expire period												10 years	5 years
Number of stock options expired (in shares)											231,000
Number of options outstanding (in shares)	1,182,000	1,261,425										0			1,182,000
Number of additional shares authorized (in shares)														1,000,000	300,000
Plan expire date															Apr. 23, 2019
Shares [Roll Forward]
Outstanding, beginning of period (in shares)	1,261,425
Options granted (in shares)	15,000
Options exercised (in shares)	(94,425)
Options canceled or expired (in shares)	0
Outstanding at end of year (in shares)	1,182,000	1,261,425										0			1,182,000
Options exercisable at year end (in shares)	1,102,000
Shares available for future grant (in shares)	254,098											0
Weighted Average Exercise Price [Roll Forward]
Outstanding at beginning of year (in dollars per share)	$ 8.27
Options granted (in dollars per share)	$ 15.75
Options exercised (in dollars per share)	$ 1.57
Options canceled or expired (in dollars per share)	$ 0
Outstanding at end of year (in dollars per share)	$ 8.90	$ 8.27
Options exercisable at year end (in dollars per share)	$ 7.90
Shares available for future grant (in dollars per share)	$ 0
Stock options by exercise price [Abstract]
Range of Options Exercise Prices, lower limit (in dollars per share)				$ 0.83	$ 4.00	$ 13.00	$ 17.00	$ 19.00	$ 26.00	$ 29.00
Range of Options Exercise Prices, upper limit (in dollars per share)				$ 2.00	$ 6.00	$ 16.00	$ 18.99	$ 21.00	$ 28.00	$ 31.00
Outstanding Shares (in shares)	1,182,000			497,500	242,000	140,000	70,000	112,500	45,000	75,000
Weighted Average Life	4 years 5 months 26 days			3 years 1 month 6 days	4 years 4 months 28 days	5 years 9 months 18 days	5 years 11 months 5 days	5 years 9 months	6 years 8 months 5 days	6 years 10 months 17 days
Weighted Average Exercise Price (in dollars per share)	$ 8.90			$ 1.01	$ 4.69	$ 13.75	$ 17.69	$ 20.57	$ 26.43	$ 29.53
Exercisable Shares (in shares)	1,102,000			497,500	242,000	140,000	60,000	62,500	45,000	55,000
Weighted Average Option price (in dollars per share)	$ 7.90			$ 1.01	$ 4.69	$ 13.75	$ 17.61	$ 20.23	$ 26.43	$ 29.64
Proceeds from stock option exercises	$ 148,425	$ 82,450	$ 673,375
Aggregate intrinsic value of options outstanding	8,000,000
Closing price of Company stock (in dollars per share)	$ 14.95
Unrecognized compensation cost	$ 26,000
Weighted average period for recognition of unrecognized compensation cost	3 months 18 days