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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
	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

X

- 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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Namespace Prefix:	invest_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Options with exercise price greater than market price

+ References

No definition available.

+ Details

Name:	leu_OptionsWithExercisePriceGreaterThanMarketPrice
Namespace Prefix:	leu_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: