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BASIS OF PRESENTATION (Details Narrative) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 28, 2019 USD ($) | Sep. 24, 2013 USD ($) $ / shares shares | Jun. 30, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) Segment | Mar. 31, 2021 USD ($) | Apr. 13, 2020 USD ($)
Number of reportable segments | Segment |  |  |  |  | 2 |  |
Cash and cash equivalents |  |  |  | $ 8,213 | $ 7,567 |  |
Working capital |  |  |  |  | 8,400 |  |
Change in note receivable |  |  | $ 194 |  | 194 |  |
Carrying value of note |  |  |  | 5,096 | 5,350 |  |
Long-term debt |  |  |  |  | 633 |  |
Current debt |  |  |  |  | 780 |  |
PPP Loan [Member] |  |  |  |  |  |  |
Long-term debt |  |  |  |  | 633 |  |
Current debt |  |  |  |  | 780 |  |
Loan face value |  |  |  |  |  |  | $ 1,404
IPO [Member] |  |  |  |  |  |  |
Issuance of common stock |  | $ 7,900 |  |  |  |  |
Issuance of common stock (in shares) | shares |  | 1,265,000 |  |  |  |  |
Share price | $ / shares |  | $ 7.00 |  |  |  |  |
Transformer Business Units [Member] |  |  |  |  |  |  |
Purchase price of divestiture | $ 68,000 |  |  |  |  |  |
Transformer Business Units [Member] | Subordinated Promissory Notes [Member] |  |  |  |  |  |  |
Principal amount | 7,500 |  |  |  |  |  |
Change in note receivable |  |  | $ 194 |  |  |  |
Cash payment for promissory note |  |  |  | 1,800 |  |  |
Revaluation of note |  |  |  |  | 254 |  |
Carrying value of note |  |  |  |  | $ 5,300 |  |
Transformer Business Units [Member] | Subordinated Promissory Notes [Member] | First Seller Note [Member] |  |  |  |  |  |  |
Principal amount | 5,000 |  |  | $ 3,200 |  |  |
Transformer Business Units [Member] | Subordinated Promissory Notes [Member] | Second Seller Note [Member] |  |  |  |  |  |  |
Principal amount | $ 2,500 |  |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |
Irrevocable standby letter of credit |  |  |  |  |  | $ 1,800 |

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