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INTANGIBLE ASSETS (Tables) | 6 Months Ended
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Jun. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Intangible Assets and Goodwill [Table Text Block] | The components of intangible assets, net consisted of the following (amounts in thousands):
| Weighted Average Useful Lives (in years) June 30, 2021 |  | June 30, 2021 |  | December 31, 2020
Amortizable intangible assets: |  |  |  |  |
Patents, trademarks and other | 12.25 |  | $ | 10,062 |  |  | $ | 10,181 |
Less accumulated amortization |  |  | (8,490) |  |  | (8,206) |
|  |  | $ | 1,572 |  |  | $ | 1,975 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] | The estimated aggregate amortization expense at June 30, 2021 for each of the years (or other periods) set forth below was as follows (amounts in thousands):
July 1 - December 31, 2021 | $ | 72 |
2022 | 145 |
2023 | 145 |
2024 | 134 |
2025 | 123 |
Thereafter | 953 |
| $ | 1,572 |

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