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v3.20.4

Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2020
Patents [Member] |
Schedule of Patent Cost and Other Asset | Patent costs, which are included in Other assets in the accompanying Consolidated Balance Sheets, as of December 31 were as follows (in thousands):
|  | 2020 |  |  | 2019 |
Patent costs |  | $ | 1,859 |  |  | $ | 1,992 |
Accumulated amortization |  |  | (1,434 | ) |  |  | (1,483 | )
|  | $ | 425 |  |  | $ | 509 |

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