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Other Income (Expense), Net (Tables) | 12 Months Ended
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Dec. 31, 2020
Other Income and Expenses [Abstract] |
Components of Other Income | The major changes in the components of Other income (expense), net for the years ended December 31 were as follows (in thousands):
|  | 2020 |  |  | 2019 |  |  | 2018 |
Rental income, net |  | $ | 792 |  |  | $ | 792 |  |  | $ | 792 |
Foreign currency gains (losses), net |  |  | 181 |  |  |  | (108 | ) |  |  | (260 | )
Interest income |  |  | 95 |  |  |  | 300 |  |  |  | 257 |
Gain on disposal of equipment |  |  | 13 |  |  |  | 38 |  |  |  | 57 |
Credit gains on available-for-sale securities |  |  | 4 |  |  |  | 4 |  |  |  | 7 |
Other |  |  | 8 |  |  |  | 40 |  |  |  | 21 |
|  | $ | 1,093 |  |  | $ | 1,066 |  |  | $ | 874 |

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