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Net Income Per Share Net Income Per Share (Schedule of Securities Excluded from Net Income Per Share) (Details) (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Options excluded from diluted net income per share 85,000leu_OptionsWithExercisePriceGreaterThanMarketPrice 1,000leu_OptionsWithExercisePriceGreaterThanMarketPrice
Warrants excluded from diluted net income per share   250,000leu_WarrantsWithExercisePriceGreaterThanMarketPrice
Exercise price of excluded options $ 5.62invest_InvestmentOptionsExercisePrice  
Exercise price of excluded warrants   $ 187.50invest_InvestmentWarrantsExercisePrice
Minimum [Member]    
Exercise price of excluded options   $ 177.50invest_InvestmentOptionsExercisePrice
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Maximum [Member]    
Exercise price of excluded options   $ 357.00invest_InvestmentOptionsExercisePrice
/ us-gaap_RangeAxis
= us-gaap_MaximumMember