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BUSINESS COMBINATION AND INVESTMENT IN AN AFFILIATED COMPANY (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Oct. 19, 2015 | Mar. 11, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |  |  |
Gain on bargain purchase |  |  |  | $ 4,833 |
Aggregate purchase price |  |  |  | 3,624 |
FAVs [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Investee ownership percentage |  | 4.90% | 4.90% |  | 4.90%
Cost method investments |  | $ 169 |  |  |
FAVs [Member] | Piedmont Aviation Component Services LLC Subsidiary [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Ownership percentage before transaction |  | 23.18% |  |  |
Gain from sale of stock |  | $ 1,198 |  |  |
FAVs [Member] | Class B Common Stock [Member] | Piedmont Aviation Component Services LLC Subsidiary [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of shares sold |  | 237,932 |  |  |
Purchase price per share |  | $ 8.40 |  |  |
Aggregate purchase price |  | $ 1,999 |  |  |
FAVs [Member] | Series A Preferred Stock [Member] | Piedmont Aviation Component Services LLC Subsidiary [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of shares sold |  | 16,253 |  |  |
Purchase price per share |  | $ 100 |  |  |
Aggregate purchase price |  | $ 1,625 |  |  |
Turbochrome Ltd. [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Ownership percentage acquired | 100.00% |  |  |  |
Maximum additional amounts which to be pay if annual revenue targets meet | $ 2,000 |  |  |  |
Gain on bargain purchase | $ 4,800 |  |  |  |
Earn out consideration paid to date |  |  |  |  | $ 500
Period of commitment to continue the engagement with acquiree''s CEO | 12 months |  |  |  |
Termination Expenses |  |  |  | 300 |
Transactions costs |  |  |  | $ 303 |
Turbochrome Ltd. [Member] | Customer relationships [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Amortization period | 10 years |  |  |  |

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