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Accounting policies (Details 1)	12 Months Ended
	Dec. 31, 2015
Retail [Member]
Estimated Fair Value Percentage Segment Reporting Information	100.00%
Retail [Member] | Discounted cash flow [Member]
Estimated Fair Value Percentage Segment Reporting Information	50.00%
Retail [Member] | Subject company stock price [Member]
Estimated Fair Value Percentage Segment Reporting Information	30.00%
Retail [Member] | Guideline public company [Member]
Estimated Fair Value Percentage Segment Reporting Information	10.00%
Retail [Member] | Mergers and acquisitions [Member]
Estimated Fair Value Percentage Segment Reporting Information	10.00%
Bulk [Member]
Estimated Fair Value Percentage Segment Reporting Information	100.00%
Bulk [Member] | Discounted cash flow [Member]
Estimated Fair Value Percentage Segment Reporting Information	50.00%
Bulk [Member] | Subject company stock price [Member]
Estimated Fair Value Percentage Segment Reporting Information	30.00%
Bulk [Member] | Guideline public company [Member]
Estimated Fair Value Percentage Segment Reporting Information	10.00%
Bulk [Member] | Mergers and acquisitions [Member]
Estimated Fair Value Percentage Segment Reporting Information	10.00%

X

- Definition

Represents the estimated fair value of reporting segments.

+ References

No definition available.

+ Details

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X

- Details

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X

- Details

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- Details

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X

- Details

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X

- Details

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X

- Details

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