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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 |  |  |

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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph c(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph d(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(b) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(a) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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