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Income Taxes (Schedule Of Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Taxes [Abstract] |  |  |
Tax expense (benefit) at statutory rate | $ (3,606) | $ 345 | $ (1,340)
Valuation allowance change | 3,952 | 153 | 719
Nondeductible executive compensation | 580 | 778 | 320
Foreign income taxes | 378 | 425 | (250)
Foreign interest disallowance | 298 | 292 |
Nondeductible entertainment expenses | 94 | 201 | 206
Foreign deferred items | (63) | 365 |
Equity compensation | (204) | (1,921) | (2,081)
State income taxes, net of federal benefit | (455) | (108) | (8)
Research and development credit | (457) | (400) | (557)
Net change in uncertain tax positions | (1,115) | (360) | (154)
Other | 106 | 154 | (406)
Total income tax benefit | $ (492) | $ (76) | $ (3,551)

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