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Accounting policies (Details1)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Retail [Member]
    
Estimated Fair Value,Percentage Segment Reporting Information 100.00% 100.00%
Retail [Member] | Discounted Cash Flow Method [Member]
    
Estimated Fair Value,Percentage Segment Reporting Information 20.00% 20.00%
Retail [Member] | Subject Company Stock Price Method [Member]
    
Estimated Fair Value,Percentage Segment Reporting Information 60.00% 40.00%
Retail [Member] | Guideline Public Company Method [Member]
    
Estimated Fair Value,Percentage Segment Reporting Information 10.00% 20.00%
Retail [Member] | Mergers and Acquisitions Method [Member]
    
Estimated Fair Value,Percentage Segment Reporting Information 10.00% 20.00%
Bulk [Member]
    
Estimated Fair Value,Percentage Segment Reporting Information 100.00% 100.00%
Bulk [Member] | Discounted Cash Flow Method [Member]
    
Estimated Fair Value,Percentage Segment Reporting Information 30.00% 10.00%
Bulk [Member] | Subject Company Stock Price Method [Member]
    
Estimated Fair Value,Percentage Segment Reporting Information 50.00% 10.00%
Bulk [Member] | Guideline Public Company Method [Member]
    
Estimated Fair Value,Percentage Segment Reporting Information 10.00% 40.00%
Bulk [Member] | Mergers and Acquisitions Method [Member]
    
Estimated Fair Value,Percentage Segment Reporting Information 10.00% 40.00%
Services [Member]
    
Estimated Fair Value,Percentage Segment Reporting Information 100.00% 100.00%
Services [Member] | Discounted Cash Flow Method [Member]
    
Estimated Fair Value,Percentage Segment Reporting Information   20.00%
Services [Member] | Subject Company Stock Price Method [Member]
    
Estimated Fair Value,Percentage Segment Reporting Information 10.00% 80.00%
Services [Member] | Net Asset Value [Member]
    
Estimated Fair Value,Percentage Segment Reporting Information 90.00%