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Net Income Per Share Net Income Per Share (Schedule of Securities Excluded from Net Income Per Share) (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Options excluded from diluted net income per share | 368,000 | 375,000
Minimum [Member] |  |
Exercise price of excluded options | $ 3.90 | $ 3.90
Maximum [Member] |  |
Exercise price of excluded options | $ 5.62 | $ 5.62

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- Definition Exercise price of the option. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Footnote 5 + Details
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- Definition Options with exercise price greater than market price + References No definition available. + Details
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Namespace Prefix: | leu_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
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Period Type: |

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- Details
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Namespace Prefix: |
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Period Type: |