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DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) $ / shares in Units, $ in Thousands |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 31, 2018 USD ($) $ / shares | Oct. 26, 2016 USD ($) | Oct. 31, 2016 USD ($) | Dec. 31, 2018 USD ($) segment $ / shares | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) $ / shares MW | Dec. 31, 2018 USD ($) facility $ / shares | Dec. 31, 2018 USD ($) $ / shares | Dec. 31, 2018 USD ($) item $ / shares | Dec. 31, 2018 USD ($) $ / shares | Dec. 31, 2017 USD ($) $ / shares | Feb. 25, 2019 USD ($) | Mar. 31, 2017 USD ($)
Description of Business |  |  |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments | segment |  |  |  | 3 |  |  |  |  |  |  |  |  |
Liquidity |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents and short-term investments |  |  |  | $ 1,177 | $ 1,177 | $ 1,177 | $ 1,177 | $ 1,177 | $ 1,177 | $ 1,177 |  |  |
Increase (decrease) in Cash and cash equivalents and Short-term investments |  |  |  |  |  |  |  |  |  |  | $ 1,099 |  |
Current borrowing capacity |  |  |  | 10,319 | 10,319 | 10,319 | 10,319 | 10,319 | 10,319 | 10,319 |  |  |
Outstanding indebtedness under the Credit Facility |  |  |  | 11,000 | 11,000 | 11,000 | 11,000 | 11,000 | 11,000 | 11,000 | 10,733 |  |
Long-term Debt, Current Maturities |  |  |  |  |  |  |  |  |  |  | 114 |  |
Inventories, net |  |  |  | 22,670 | 22,670 | 22,670 | 22,670 | 22,670 | 22,670 | 22,670 | 19,279 |  |
Increase (Decrease) in inventories |  |  |  |  |  |  |  |  |  | 2,944 | $ (7,057) |  |
Total debt and capital lease obligations |  |  |  | 14,876 | 14,876 | 14,876 | 14,876 | 14,876 | 14,876 | 14,876 |  |  |
Long-term Debt and Capital Lease Obligations, Repayments of Principal in Next Twelve Months |  |  |  | $ 12,897 | $ 12,897 | $ 12,897 | $ 12,897 | $ 12,897 | $ 12,897 | $ 12,897 |  |  |
Common stock, par value (in dollars per share) | $ / shares | $ 0.001 |  |  | $ 0.001 | $ 0.001 | $ 0.001 | $ 0.001 | $ 0.001 | $ 0.001 | $ 0.001 | $ 0.001 |  |
Proceeds from issuance of stock |  |  |  |  |  |  |  |  |  | $ 33 |  |  |
Sales agent commission percentage |  |  |  |  |  |  |  | 3.00% |  |  |  |  |
Sale of common stock, net of expenses (shares) | shares |  |  |  |  | 15,112 |  |  |  |  |  |  |  |
Commission paid to agent |  |  |  |  |  |  |  |  |  | 1 |  |  |
ATM common stock available for issuance |  |  |  | $ 9,967 | $ 9,967 | $ 9,967 | $ 9,967 | $ 9,967 | $ 9,967 | 9,967 |  |  |
NMTC note payable |  |  |  | 13,338 | 13,338 | 13,338 | 13,338 | 13,338 | 13,338 | 13,338 |  |  |
Cash and Cash Equivalents and Short-Term Investments |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  | $ 1,177 | $ 1,177 | $ 1,177 | $ 1,177 | $ 1,177 | $ 1,177 | 1,177 | $ 78 |  |
Interest income |  |  |  |  |  |  |  |  |  | $ 5 | $ 5 |  |
Credit facility |  |  |  |  |  |  |  |  |  |  |  |  |
Liquidity |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 20,000 | $ 10,000 |  |  |  |  |  |  |  |  | $ 35,000 | $ 25,000
Maximum borrowing capacity of the face value of eligible A/R (as a percent) |  | 85.00% | 85.00% |  |  |  |  |  |  |  |  |  |
Maximum percentage of book value of inventories that may be financed |  |  | 50.00% | 50.00% | 50.00% | 50.00% | 50.00% | 50.00% | 50.00% | 50.00% |  |  |
Long-term Line of Credit |  |  |  | $ 11,000 | $ 11,000 | $ 11,000 | $ 11,000 | $ 11,000 | $ 11,000 | $ 11,000 |  |  |
Current borrowing capacity |  |  |  | 10,319 | 10,319 | 10,319 | 10,319 | 10,319 | 10,319 | 10,319 |  |  |
Outstanding indebtedness under the Credit Facility |  |  |  | 0 | 0 | $ 0 | $ 0 | 0 | $ 0 | 0 |  |  |
Maximum borrowing capacity of the face value of machinery, equipment and property that may be financed |  | 50.00% | 50.00% |  |  |  |  |  |  |  |  |  |
Towers and Heavy Fabrications |  |  |  |  |  |  |  |  |  |  |  |  |
Description of Business |  |  |  |  |  |  |  |  |  |  |  |  |
Number of facilities | facility |  |  |  |  |  |  | 2 |  |  |  |  |  |
Number of tower sections |  |  |  |  |  |  | 1,650 |  | 1,650 |  |  |  |
New Markets Tax Credit Transaction |  |  |  |  |  |  |  |  |  |  |  |  |
Principles of Consolidation and Basis of Presentation |  |  |  |  |  |  |  |  |  |  |  |  |
Number of VIE's | item |  |  |  |  |  |  |  |  | 2 |  |  |  |
Minimum | Towers and Heavy Fabrications |  |  |  |  |  |  |  |  |  |  |  |  |
Description of Business |  |  |  |  |  |  |  |  |  |  |  |  |
Power generating capacity of turbines that towers produced annually can support (in megawatts) | MW |  |  |  |  |  | 1,100 |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Liquidity |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of stock | $ 10,000 |  |  |  |  |  |  |  |  |  |  |  |
Maximum | Credit facility |  |  |  |  |  |  |  |  |  |  |  |  |
Liquidity |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | $ 10,000 | $ 10,000 | $ 10,000 | $ 10,000 | $ 10,000 | $ 10,000 | $ 10,000 |  |  |
Maximum | Towers and Heavy Fabrications |  |  |  |  |  |  |  |  |  |  |  |  |
Description of Business |  |  |  |  |  |  |  |  |  |  |  |  |
Annual tower production capacity (in towers) | item |  |  |  |  |  |  |  |  | 550 |  |  |  |

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