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Income Taxes (Narrative) (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Income Taxes [Line Items] |  |
Statutory Federal Income Tax Rate | 21.00% |
Unrecognized tax benefits that would impact effective tax rate | $ 0 | $ 0
Idaho [Member] |  |
Income Taxes [Line Items] |  |
Investment Tax Credits | $ 1,900,000 |
Earliest Tax Year [Member] | Idaho [Member] |  |
Income Taxes [Line Items] |  |
Idaho Investment Tax Credits expiration year | 2026 |
Latest Tax Year [Member] | Idaho [Member] |  |
Income Taxes [Line Items] |  |
Idaho Investment Tax Credits expiration year | 2034 |
Federal [Member] |  |
Income Taxes [Line Items] |  |
Operating Loss Carryforwards | $ 0 |
State and Local [Member] |  |
Income Taxes [Line Items] |  |
Operating Loss Carryforwards | $ 0 |

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