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Operations In Foreign Currency (Summary Of Currency Exchange Rates) (Details) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Spot Rate [Member] |  |  |  |  |
Currency Exchange Rates [Line Items] |  |  |  |  |
Foreign currency exchange rate | 0.6245 | 0.6978 |  |  |
Australian Dollar [Member] | Spot Rate [Member] |  |  |  |  |
Currency Exchange Rates [Line Items] |  |  |  |  |
Foreign currency exchange rate | 0.6905 | 0.7496 | 0.6905 | 0.7496 | 0.7260
Australian Dollar [Member] | Average Rate [Member] |  |  |  |  |
Currency Exchange Rates [Line Items] |  |  |  |  |
Foreign currency exchange rate | 0.7143 | 0.7702 | 0.7192 | 0.7716 | 0.7517
New Zealand Dollar [Member] | Spot Rate [Member] |  |  |  |  |
Currency Exchange Rates [Line Items] |  |  |  |  |
Foreign currency exchange rate |  |  | 0.6245 | 0.6978 | 0.6839
New Zealand Dollar [Member] | Average Rate [Member] |  |  |  |  |
Currency Exchange Rates [Line Items] |  |  |  |  |
Foreign currency exchange rate | 0.6500 | 0.7153 | 0.6631 | 0.7173 | 0.7077

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