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LONG-TERM DEBT (Details) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
May 31, 2019 USD ($) | Jun. 05, 2019 USD ($) | Apr. 30, 2016 USD ($) shares $ / shares | Jan. 31, 2015 USD ($) shares $ / shares | Apr. 28, 2019 USD ($) | Apr. 28, 2019 USD ($) | Oct. 31, 2018 USD ($) | Mar. 31, 2011 USD ($)
Long-term debt [Abstract] |  |  |  |  |  |  |  |
Long term debt |  |  |  |  | $ 36,426 | $ 36,426 | $ 57,453 |
Current portion |  |  |  |  | (505) | (505) | (57,453) |
Long-term debt noncurrent |  |  |  |  | $ 35,921 | 35,921 | 0 |
Cash limit for dividends, distributions and redemption on equity |  |  |  |  |  | $ 100,000 |  |
Short Term Debt Due in February 2019 [Member] |  |  |  |  |  |  |  |
Long-term debt [Abstract] |  |  |  |  |  |  |  |
Interest rate percentage |  |  |  |  | 4.90% | 4.90% |  |
Maturity date of debt |  |  |  |  |  | Feb. 28, 2019 |  |
Repayments of debt |  |  |  |  |  | $ 3,700 |  |
Term of loan |  |  |  |  |  | 90 days |  |
Project Loan [Member] |  |  |  |  |  |  |  |
Long-term debt [Abstract] |  |  |  |  |  |  |  |
Interest rate percentage |  |  |  |  | 4.90% | 4.90% |  |
Maximum borrowing capacity |  |  |  |  | $ 50,000 | $ 50,000 |  |
Project Loan [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Long-term debt [Abstract] |  |  |  |  |  |  |  |
Proceeds from credit facility |  | $ 9,700 |  |  |  |  |  |
Project Loan Due December 2025 [Member] |  |  |  |  |  |  |  |
Long-term debt [Abstract] |  |  |  |  |  |  |  |
Long term debt |  |  |  |  | 11,400 | $ 11,400 | 0 |
Maturity date of debt |  |  |  |  |  | Dec. 31, 2025 |  |
Date of first required payment |  |  |  |  |  | Jun. 30, 2023 |  |
Proceeds from credit facility |  |  |  |  | 11,400 |  |  |
Project Loan Due December 2022 [Member] |  |  |  |  |  |  |  |
Long-term debt [Abstract] |  |  |  |  |  |  |  |
Long term debt |  |  |  |  | 14,932 | $ 14,932 | 0 |
Maturity date of debt |  |  |  |  |  | Dec. 31, 2022 |  |
Date of first required payment |  |  |  |  |  | Jun. 30, 2020 |  |
Working Capital Loan due January 2022 [Member] |  |  |  |  |  |  |  |
Long-term debt [Abstract] |  |  |  |  |  |  |  |
Long term debt |  |  |  |  | $ 10,094 | $ 10,094 | 0 |
Interest rate percentage |  |  |  |  | 5.00% | 5.00% |  |
Basis spread on variable rate |  |  |  |  |  | 0.6775% |  |
Maturity date of debt |  |  |  |  |  | Jan. 31, 2022 |  |
Date of first required payment |  |  |  |  |  | May 31, 2019 |  |
Maximum borrowing capacity |  |  |  |  | $ 25,000 | $ 25,000 |  |
Proceeds from credit facility |  |  |  |  |  | 13,800 |  |
Working Capital Loan due January 2022 [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Long-term debt [Abstract] |  |  |  |  |  |  |  |
Amount outstanding under credit facility | $ 1,900 |  |  |  |  |  |  |
Repayments of debt | $ 100 |  |  |  |  |  |  |
3.25% Convertible Senior Notes Matured April 2019 [Member] |  |  |  |  |  |  |  |
Long-term debt [Abstract] |  |  |  |  |  |  |  |
Long term debt |  |  |  |  | 0 | 0 | $ 57,453 |
Face amount of debt |  |  |  |  | $ 57,500 | $ 57,500 |  |
Interest rate percentage |  |  |  |  | 3.25% | 3.25% |  |
Maturity date of debt |  |  |  |  |  | Apr. 01, 2019 |  |
Number of shares each note is convertible to (in shares) | shares |  |  |  | 96 |  |  |  |
Face amount of each note converted |  |  |  | $ 1 |  |  |  |
Conversion price per share (in dollars per share) | $ / shares |  |  |  | $ 10.37 |  |  |  |
Repayments of debt |  |  |  |  |  | $ 57,500 |  |
Amended and Restated Credit Agreement [Member] |  |  |  |  |  |  |  |
Long-term debt [Abstract] |  |  |  |  |  |  |  |
Maturity date of debt |  |  |  |  |  | Sep. 30, 2023 |  |
Current borrowing capacity |  |  |  |  | $ 50,000 | $ 50,000 |  |
Maximum borrowing capacity |  |  |  |  | 100,000 | 100,000 |  |
Amount outstanding under credit facility |  |  |  |  | 0 | 0 |  |
Available borrowing capacity |  |  |  |  | $ 50,000 | $ 50,000 |  |
Effective interest rate |  |  |  |  | 2.50% | 2.50% |  |
3.25% Convertible Senior Notes due in April 2016 [Member] |  |  |  |  |  |  |  |
Long-term debt [Abstract] |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  |  | $ 57,500
Interest rate percentage |  |  | 3.25% |  |  |  |  |
Maturity date of debt |  |  | Apr. 01, 2016 |  |  |  |  |
Number of shares each note is convertible to (in shares) | shares |  |  | 96 |  |  |  |  |
Face amount of each note converted |  |  | $ 1 |  |  |  |  |
Conversion price per share (in dollars per share) | $ / shares |  |  | $ 10.37 |  |  |  |  |

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