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.

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Aggregate number of common shares reserved for future issuance.

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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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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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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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Stock-Based Compensation (Details) - USD ($) $ in Thousands				12 Months Ended
Stock-Based Compensation (Details) - USD ($) $ in Thousands	May 05, 2016	Nov. 28, 2006	Mar. 29, 2006	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Mar. 29, 2016
Stock-Based Compensation Plans
Stock-based compensation expense				$ 1,368	$ 976	$ 879
Prior Plans
Stock-Based Compensation Plans
Numbers of shares available for grant (in shares)	0
The 2016 Plan
Stock-Based Compensation Plans
Number of shares authorized	1,000,000
Shares available for future issuance				418,517
Option expiration term	10 years
Legacy Dawson Plan
Stock-Based Compensation Plans
Numbers of shares available for grant (in shares)	0
Option expiration term		10 years
Legacy TGC Plan
Stock-Based Compensation Plans
Numbers of shares available for grant (in shares)							0
Option expiration term			10 years
Stock options
Stock-Based Compensation Plans
Stock-based compensation expense						42
Restricted stock
Stock-Based Compensation Plans
Stock-based compensation expense				$ 915	495	347
Restricted stock units
Stock-Based Compensation Plans
Stock-based compensation expense				122	161	73
Common stock awards
Stock-Based Compensation Plans
Stock-based compensation expense				$ 331	$ 320	$ 417