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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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Income taxes.

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+ References

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-Publisher FASB
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