XML 52 R37.htm IDEA: XBRL DOCUMENT
v3.8.0.1

1. NATURE OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) | 12 Months Ended
--- | ---
Dec. 31, 2017
90-120 days |
Percent collected | 49.00%
121-150 days |
Percent collected | 42.00%
151-180 days |
Percent collected | 52.00%
181-210 days |
Percent collected | 100.00%
211-240 days |
Percent collected | 100.00%

X
- References No definition available. + Details
Name: | gure_AccountsReceivablePercentCollected
Namespace Prefix: | gure_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RangeAxis=gure_From90To120DaysMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=gure_From121To150DaysMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=gure_From151To180DaysMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=gure_From181To210DaysMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=gure_From211To240DaysMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |