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Stock-Based Compensation (Details) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Sep. 30, 2014	May 05, 2016
Share-Based Compensation Plans
Stock-based compensation expense	$ 452,000	$ 879,000	$ 1,156,000	$ 1,225,000
The 2016 Plan
Share-Based Compensation Plans
Numbers of shares available for grant ( in shares)		0
Number of shares authorized		1,000,000
Shares available for future issuance		971,514
Option expiration term		10 years
Legacy Dawson Plan
Share-Based Compensation Plans
Shares available for future issuance					0
Option expiration term		10 years
Legacy TGC Plan
Share-Based Compensation Plans
Shares available for future issuance		0
Option expiration term		10 years
Unvested stock options
Share-Based Compensation Plans
Stock-based compensation expense		$ 42,000
Restricted stock
Share-Based Compensation Plans
Stock-based compensation expense	213,000	$ 347,000	363,000	821,000
Grants outstanding (in shares)		87,000
Restricted stock units
Share-Based Compensation Plans
Stock-based compensation expense	74,000	$ 73,000	$ 526,000	233,000
Grants outstanding (in shares)		253,315	129,247
Common Stock Awards
Share-Based Compensation Plans
Stock-based compensation expense	$ 165,000	$ 417,000	$ 267,000	$ 171,000

X

- Definition

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
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-SubTopic 10
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Aggregate number of common shares reserved for future issuance.

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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

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