Note 4 - Gas Purchase Agreements (Details Textual)	Mar. 31, 2017 Mcf $ / Mcf
Oil and Gas Delivery Commitments and Contracts, Significant Supplies Dedicated or Contracted to Entity \| Mcf	540,000
Oil and Gas Delivery Commitments and Contracts, Fixed Price \| $ / Mcf	2.84

Significant oil and gas supplies dedicated or contracted to the enterprise that can be used to fulfill existing contracts or agreements.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1207
-Paragraph (b)
-Subparagraph (2)(ii)

Name:	us-gaap_OilAndGasDeliveryCommitmentsAndContractsSignificantSuppliesDedicatedOrContractedToEntity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant