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Operations In Foreign Currency (Summary Of Currency Exchange Rates) (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Australian Dollar [Member] | Spot Rate [Member] |  |  |
Currency Exchange Rates [Line Items] |  |  |
Foreign currency exchange rate | 0.7613 | 0.6139 | 0.7709
Australian Dollar [Member] | Average Rate [Member] |  |  |
Currency Exchange Rates [Line Items] |  |  |
Foreign currency exchange rate | 0.7730 | 0.6578 | 0.6904
New Zealand Dollar [Member] | Spot Rate [Member] |  |  |
Currency Exchange Rates [Line Items] |  |  |
Foreign currency exchange rate | 0.6989 | 0.5959 | 0.7194
New Zealand Dollar [Member] | Average Rate [Member] |  |  |
Currency Exchange Rates [Line Items] |  |  |
Foreign currency exchange rate | 0.7194 | 0.6349 | 0.6504

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