| Waarde van de handelsgoederen. | nl | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |
| Stock commodities | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Handelsgoederen | nl | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Stock commodities, ending balance | en | http://www.xbrl.org/2003/role/periodEndLabel | http://www.xbrl.org/2003/role/link |
| Handelsgoederen, einde van de periode | nl | http://www.xbrl.org/2003/role/periodEndLabel | http://www.xbrl.org/2003/role/link |
| Stock commodities, beginning balance | en | http://www.xbrl.org/2003/role/periodStartLabel | http://www.xbrl.org/2003/role/link |
| Handelsgoederen, begin van de periode | nl | http://www.xbrl.org/2003/role/periodStartLabel | http://www.xbrl.org/2003/role/link |