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OTHER ASSETS (Details Narrative) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2019 | Jun. 28, 2019 | Dec. 31, 2018 | Jan. 31, 2012 | Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Right of use assets | $ 1,800 | $ 1,800 |  | $ 2,200 |  |
Write-off of notes receivable | 600 | 600 |  |  |  |
Transformer Business Units [Member] | Subordinated Promissory Notes [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Principal amount |  |  | $ 7,500 |  |  |
Carrying value of note | $ 6,600 | $ 6,600 |  |  |  |
Interest rate | 4.00% | 4.00% |  |  |  |
Notes Receivable - Developer [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Principal amount |  |  |  |  | $ 300 | $ 300
Interest rate |  |  |  |  | 4.50% | 4.50%
Write-off of notes receivable | $ 600 |  |  |  |  |

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