Commitment and Contingencies (Details Textual)	Sep. 30, 2018 USD ($)
Commitment and Contingencies (Textual)
Liability related to firm transportation contracts assumed	$ 166,000
Capital commitment	6,900,000
Class A [Member]
Commitment and Contingencies (Textual)
Capital commitment	$ 23,600,000

Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions.

No definition available.

Name:	us-gaap_OtherCommitment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant