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Intangible assets	12 Months Ended
Intangible assets	Dec. 31, 2022
Intangible Assets And Goodwill [Abstract]
Intangible Assets And Goodwill	10. Intangible assets A. Reconciliation of carrying amount At December 31, 2022 Intellectual Contracts property Total Cost Beginning of year $ 110,618 $ 118,819 $ 229,437 Effect of movements in exchange rates 8,027 - 8,027 End of year 118,645 118,819 237,464 Accumulated amortization and impairment Beginning of year 109,886 68,304 178,190 Amortization charge 739 3,454 4,193 Effect of movements in exchange rates 7,964 - 7,964 End of year 118,589 71,758 190,347 Net book value at December 31, 2022 $ 56 $ 47,061 $ 47,117 At December 31, 2021 Intellectual Contracts property Total Cost Beginning of year $ 111,388 $ 118,819 $ 230,207 Effect of movements in exchange rates (770) - (770) End of year 110,618 118,819 229,437 Accumulated amortization and impairment Beginning of year 109,663 64,722 174,385 Amortization charge 975 3,582 4,557 Effect of movements in exchange rates (752) - (752) End of year 109,886 68,304 178,190 Net book value at December 31, 2021 $ 732 $ 50,515 $ 51,247 B. Amortization The intangible asset values relate to intellectual property acquired with Cameco Fuel Manufacturing Inc. (CFM) and purchase and sales contracts acquired with NUKEM. The CFM intellectual property is being amortized on a unit-of-production basis over its remaining life. Amortization is allocated to the cost of inventory and is recognized in cost of products and services sold as inventory was sold. The purchase and sales contracts were amortized to earnings over the terms of the underlying contracts. Amortization of the purchase contracts was allocated to the cost of inventory and included in cost of products and services sold as inventory was sold. Sales contracts were amortized to revenue.