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Investment funds (Tables) | 12 Months Ended
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Dec. 31, 2014
Investment Income, Net [Abstract] |
Investment Holdings, Schedule of Investments [Table Text Block] | The following table summarizes the balances of investments in investment funds:
|  | December 31, |
|  | 2014 |  | 2013 |
Alpha4X Feeder Fund |  |  | 52,472 |  |  | 113,069 |
Alpha4X Latam Fundo de Investimento Multimercado |  |  | 5,102 |  |  | 5,592 |
|  |  | 57,574 |  |  | 118,661 |

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- Definition Tabular disclosure of data and information required in the supplementary schedule applicable to management investment companies listing holdings of unaffiliated investments. + References No definition available. + Details
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