EMPLOYEE STOCK OPTION PLANS (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Weighted-average assumptions used for options granted
Risk-free interest rate (in hundredths)	0.90%	2.08%	2.55%
Expected volatility (in hundredths)	101.80%	100.90%	97.00%
Dividend yield (in hundredths)	0.00%	0.00%	0.00%
Expected option term-in years	5 years	5 years	5 years
Period of treasury note considered for risk free interest rate	5 years	5 years	5 years
Period considered for volatility rate	4 years	4 years	4 years
Historical forfeiture rate of options, maximum (in hundredths)	1.00%
Options [Roll Forward]
Outstanding at beginning of period (in shares)	695,000	780,333	1,052,333
Granted (in shares)	40,517	80,000	80,000
Exercised (in shares)	(240,000)	(165,333)	(272,000)
Forfeited/Expired (in shares)	0	0	(80,000)
Outstanding at end of period (in shares)	495,517	695,000	780,333	1,052,333
Vested at December 31, 2011 (in shares)	495,517
Weighted average Exercise Price [Abstract]
Outstanding at beginning of period (in dollars per share)	$ 8.33	$ 6.68	$ 6.47
Granted (in dollars per share)	$ 11.87	$ 14.90	$ 7.38
Exercised (in dollars per share)	$ 6.85	$ 3.72	$ 5.11
Forfeited/Expired (in dollars per share)	$ 0	$ 0	$ 10.01
Outstanding at end of period (in dollars per share)	$ 9.33	$ 8.33	$ 6.68	$ 6.47
Vested at December 31, 2011 (in dollars per share)	$ 9.33
Weighted average remaining contractual term [Abstract]
Outstanding	2 years 8 months 23 days	2 years 7 months 28 days	2 years 11 months 1 day	3 years 10 months 28 days
Vested at December 31, 2011	2 years 8 months 23 days
Aggregate Intrinsic Value [Abstract]
Outstanding and expected to vest, at end of period	$ 858,997
Vested at December 31, 2011	858,997
Weighted-average fair value of each option granted (in dollars per share)	$ 8.91	$ 11.24	$ 5.47
Unrecognized compensation cost related to non-vested stock option awards	0	21,687	108,435
Fair market value of common stock upon exercise of options	0	159,000	288,420
Tax Benefit from Stock Options Exercised	313,000	438,000	304,000
Intrinsic value of options exercised	1,337,000	1,609,000	1,936,000
Fair value of options vested	859,000	2,625,000	563,000
Non-Employee Director [Member]
Aggregate Intrinsic Value [Abstract]
Stock options, maximum contractual term	5 years
Employees [Member]
Aggregate Intrinsic Value [Abstract]
Stock options, maximum contractual term	10 years
Stock options, vesting period	3 years
Issue of Stock for Cash [Member]
Aggregate Intrinsic Value [Abstract]
Proceeds from exercise of stock options	1,187,700
Fair market value of common stock upon exercise of options	69,095
Issue of Stock for Noncash Consideration [Member]
Aggregate Intrinsic Value [Abstract]
Exchange of common stock upon exercise of stock options (in shares)	20,935
Fair market value of common stock upon exercise of options	216,630
Issue of Stock for Cash and Noncash Consideration [Member]
Aggregate Intrinsic Value [Abstract]
Proceeds from exercise of stock options	102,815
Exchange of common stock upon exercise of stock options (in shares)	4,589
Fair market value of common stock upon exercise of options	69,930
Issue of Stock for cash and Noncash consideration transaction 2 [Member]
Aggregate Intrinsic Value [Abstract]
Exchange of common stock upon exercise of stock options (in shares)	4,333
Stock Option Plan 1995 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-cash compensation expense	383,000	986,000	554,000
Tax benefit upon exercise of options	$ 528,000	$ 547,000	$ 123,000
Common shares reserved for issuance (in shares)	200,000
Options exercisable price as percentage of closing price granted to president and specific persons (in hundredths)	110.00%
Performance Equity Plan 1998 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares reserved for issuance (in shares)	463,334
Options exercisable price as percentage of closing price granted to president and specific persons (in hundredths)	110.00%
Performance Equity Plan 2000 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares reserved for issuance (in shares)	1,230,000
Options exercisable price as percentage of closing price granted to president and specific persons (in hundredths)	110.00%
Performance Equity Plan 2009 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares reserved for issuance (in shares)	500,000
Options exercisable price as percentage of closing price granted to president and specific persons (in hundredths)	110.00%
Percentage of voting stock considered for higher exercise price (in hundredths)	10.00%
Options available for grant (in shares)	280,266