Earnings Per Share (Details Textual)	Mar. 31, 2019
Maurepas Pipeline LLC [Member]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	49.00%

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

No definition available.

Name:	us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant