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Credit Agreements (Details) - Line of Credit - Senior Secured Reserve-Based Credit Facility - Revolving Credit Facility	Apr. 11, 2016 USD ($)	Jun. 30, 2018 USD ($)	Feb. 01, 2018 USD ($)
Debt Instrument [Line Items]
Term of debt instrument	3 years
Maximum borrowing capacity	$ 50,000,000
Initial borrowing base	$ 10,000,000		$ 40,000,000
Placement fee percentage	0.50%
Placement fee amount	$ 50,000
Commitment fee percentage	0.25%
Maximum total leverage ratio	3
Debt service coverage ratio	1.10
Minimum consolidated tangible net worth	$ 50,000,000
Debt issuance costs	$ 168,972
Unamortized debt issuance costs		$ 42,201
LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	2.75%
Prime Rate
Debt Instrument [Line Items]
Basis spread on variable rate	1.00%

X

- Definition

Debt Covenant, Maximum Total Leverage Ratio

+ References

No definition available.

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- Definition

Debt Service Coverage Ratio

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X

- Definition

Line of Credit Facility, Covenant Compliance, Minimum Consolidated Tangible Net Worth

+ References

No definition available.

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X

- Definition

Line of Credit Facility, Initial Borrowing Base

+ References

No definition available.

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- Definition

Line of Credit Facility, Placement Fee Percentage

+ References

No definition available.

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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- Definition

Amount of the fee that accompanies borrowing money under the debt instrument.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-SubTopic 30
-Section 45
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- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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- Definition

The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

+ References

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-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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