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Significant Accounting Policies (Schedule Of Exchange Rates To US Dollar) (Details) | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Canadian Dollar (CAD) [Member] |  |  |
Currency [Line Items] |  |  |
Ending Rates | 1.3550 | 1.2678 |
Average Rates | 1.3011 | 1.2537 | 1.3412
Average Rates % Change | (3.80%) | 6.50% |
Euros (EUR) [Member] |  |  |
Currency [Line Items] |  |  |
Ending Rates | 0.9393 | 0.8810 |
Average Rates | 0.9506 | 0.8456 | 0.8776
Average Rates % Change | (12.40%) | 3.60% |
Polish Zloty (PLN) [Member] |  |  |
Currency [Line Items] |  |  |
Ending Rates | 4.4004 | 4.0492 |
Average Rates | 4.4559 | 3.8608 | 3.8989
Average Rates % Change | (15.40%) | 1.00% |
British Pound (GBP) [Member] |  |  |
Currency [Line Items] |  |  |
Average Rates |  | 0.7270 | 0.7798
Average Rates % Change |  | 6.80% |

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