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Stock-Based Compensation (Details)		3 Months Ended	12 Months Ended
	Feb. 11, 2015 shares	Dec. 31, 2014 USD ($) shares	Dec. 31, 2015 USD ($) item shares	Sep. 30, 2014 USD ($) shares	Sep. 30, 2013 USD ($)	Dec. 31, 2006 shares
Share-Based Compensation Plans
Number of stock-based compensation plans | item			2
Stock-based compensation expense | $		$ 452,000	$ 1,156,000	$ 1,225,000	$ 1,797,000
Legacy Dawson Plan
Share-Based Compensation Plans
Number of shares authorized	827,647					750,000
Legacy Dawson Plan | Maximum
Share-Based Compensation Plans
Option expiration term	10 years
Legacy Dawson Plan | Officers, directors, employees or consultants after merger
Share-Based Compensation Plans
Number of shares authorized	466,136
Legacy TGC Plan
Share-Based Compensation Plans
Number of shares authorized	1,000,000
Legacy TGC Plan | Maximum
Share-Based Compensation Plans
Option expiration term	10 years
Legacy TGC Plan | Officers, directors, employees or consultants after merger
Share-Based Compensation Plans
Number of shares authorized	412,254
Stock options
Share-Based Compensation Plans
Stock-based compensation expense | $					62,000
Restricted Stock Awards
Share-Based Compensation Plans
Stock-based compensation expense | $		213,000	363,000	821,000	1,307,000
Restricted Stock Awards | Legacy TGC Plan
Share-Based Compensation Plans
Grants outstanding (in shares)	0
Restricted Stock Units
Share-Based Compensation Plans
Stock-based compensation expense | $		$ 74,000	$ 526,000	$ 233,000	25,000
Grants outstanding (in shares)		133,453	129,247	38,555
Common Stock Awards
Share-Based Compensation Plans
Stock-based compensation expense | $		$ 165,000	$ 267,000	$ 171,000	$ 403,000

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- Definition

The number of share-based compensation plans approved by the entity's shareholders.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 14.F)
-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14
-Section F

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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- Definition

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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