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DEBT AND CREDIT AGREEMENTS (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 26, 2016 | Oct. 31, 2016 | Sep. 30, 2018 | Dec. 31, 2018 | Feb. 25, 2019 | Dec. 31, 2017 | Mar. 31, 2017 | Dec. 31, 2016
Credit Facilities |  |  |  |  |  |  |  |
Line of credit |  |  |  | $ 11,000 |  | $ 10,733 |  |
Less: Current portion |  |  |  | (11,930) |  | (14,252) |  |
Long-term debt, net of current maturities |  |  |  | 1,408 |  | 797 |  |
Current borrowing capacity |  |  |  | 10,319 |  |  |  |
Extinguishment gain |  |  |  | 2,249 |  |  |  |
Current maturities of long-term debt |  |  |  |  |  | 114 |  |
Future annual principal payments |  |  |  |  |  |  |  |
2019 |  |  |  | 12,045 |  |  |  |
2020 |  |  |  | 913 |  |  |  |
2021 |  |  |  | 266 |  |  |  |
2022 |  |  |  | 114 |  |  |  |
Total |  |  |  | 13,338 |  |  |  |
New Markets Tax Credit Transaction |  |  |  |  |  |  |  |
Credit Facilities |  |  |  |  |  |  |  |
NMTC note payable |  |  |  | 2,600 |  | 2,600 |  |
Extinguishment gain |  |  | $ 2,249 |  |  |  |  |
Capital Expenditure loan |  |  |  |  |  |  |  |
Credit Facilities |  |  |  |  |  |  |  |
Long-term debt |  |  |  | 1,882 |  | 1,146 |  |
Current maturities of long-term debt |  |  |  | $ 930 |  | 804 |  |
Interest rate (as a percent) |  |  |  | 5.00% |  |  |  |
Capital Expenditure loan | Minimum |  |  |  |  |  |  |  |
Credit Facilities |  |  |  |  |  |  |  |
Monthly payments on notes payable |  |  |  | $ 3 |  |  |  |
Capital Expenditure loan | Maximum |  |  |  |  |  |  |  |
Credit Facilities |  |  |  |  |  |  |  |
Monthly payments on notes payable |  |  |  | 36 |  |  |  |
Development Corporation of Abilene loan |  |  |  |  |  |  |  |
Credit Facilities |  |  |  |  |  |  |  |
Long-term debt |  |  |  | 456 |  | 570 |  | $ 570
Loan forgiven |  |  |  | 114 |  |  |  |
Credit facility |  |  |  |  |  |  |  |
Credit Facilities |  |  |  |  |  |  |  |
Line of credit |  |  |  | $ 0 |  |  |  |
Maximum borrowing capacity | $ 20,000 | $ 10,000 |  |  | $ 35,000 |  | $ 25,000 |
Line of credit facilities, term of credit agreements | 3 years |  |  |  |  |  |  |
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% |  |  |  |
Maximum borrowing capacity of the face value of machinery, equipment and property that may be financed | 50.00% | 50.00% |  |  |  |  |  |
Annual unused line fee (as a percent) | 0.50% |  |  |  |  |  |  |
Current borrowing capacity |  |  |  | $ 10,319 |  |  |  |
Credit facility | Minimum |  |  |  |  |  |  |  |
Credit Facilities |  |  |  |  |  |  |  |
Variable rate basis | 2.25% |  |  |  |  |  |  |
Interest rate margin (as a percent) | 0.00% |  |  |  |  |  |  |
Credit facility | Maximum |  |  |  |  |  |  |  |
Credit Facilities |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | $ 10,000 |  |  |  |
Variable rate basis | 3.00% |  |  |  |  |  |  |
Interest rate margin (as a percent) | 1.00% |  |  |  |  |  |  |
Term loans and notes payable | New Markets Tax Credit Transaction |  |  |  |  |  |  |  |
Credit Facilities |  |  |  |  |  |  |  |
NMTC note payable |  |  |  |  |  | $ 2,600 |  |

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