Accounting policies (Details 1)	12 Months Ended
	Dec. 31, 2018
Retail [Member]
Estimated Fair Value Percentage Segment Reporting Information	100.00%
Retail [Member] | Discounted cash flow [Member]
Estimated Fair Value Percentage Segment Reporting Information	80.00%
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	80.00%
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%
Manufacturing Units [Member]
Estimated Fair Value Percentage Segment Reporting Information	100.00%
Manufacturing Units [Member] | Discounted cash flow [Member]
Estimated Fair Value Percentage Segment Reporting Information	80.00%
Manufacturing Units [Member] | Guideline public company [Member]
Estimated Fair Value Percentage Segment Reporting Information	10.00%
Manufacturing Units [Member] | Mergers and acquisitions [Member]
Estimated Fair Value Percentage Segment Reporting Information	10.00%