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Revisions of Prior Period Financial Statements (Revised Consolidated Statements of Income) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								6 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenue:
Revenues	$ 19,706	$ 20,852	$ 19,895	$ 17,991	$ 16,160	$ 16,396	$ 18,204	$ 14,718			$ 78,444	$ 65,478	$ 67,693
Operating costs and expenses:
Cost of rentals, exclusive of depreciation stated separately below											27,583	21,860	18,160
Depreciation and amortization											23,268	22,080	21,316
Operating costs and expenses											93,597	65,985	66,222
Operating income (loss)	(1,289)	(14,021)	302	(145)	(491)	(500)	179	305			(15,153)	(507)	1,471
Income (loss) before provision for income taxes											(14,557)	(394)	1,507
(Provision for) benefit from income taxes:
Current											31	242	(3,288)
Deferred											662	(314)	21,575
Total income tax benefit (expense)											693	(72)	18,287
Net income (loss)	$ (1,710)	$ (12,579)	$ 327	$ 98	$ (749)	$ (118)	$ 211	$ 190			$ (13,864)	$ (466)	$ 19,794
Earnings Per Share [Abstract]
Earnings (loss) per share - Basic (in dollars per share)	$ (0.13)	$ (0.96)	$ 0.02	$ 0.01	$ (0.06)	$ (0.01)	$ 0.02	$ 0.01	$ 0.03	$ (0.93)	$ (1.06)	$ (0.04)	$ 1.54
Earnings (loss) per share - Diluted (in dollars per share)	$ (0.13)	$ (0.96)	$ 0.02	$ 0.01	$ (0.06)	$ (0.01)	$ 0.02	$ 0.01	$ 0.03	$ (0.93)	$ (1.06)	$ (0.04)	$ 1.51
As Reported
Revenue:
Revenues		$ 20,852	$ 19,895	$ 17,991	$ 16,160	$ 16,396	$ 18,204	$ 14,718				$ 65,478	$ 67,693
Operating costs and expenses:
Cost of rentals, exclusive of depreciation stated separately below												20,746	18,078
Depreciation and amortization												22,049	21,302
Operating costs and expenses												64,840	66,126
Operating income (loss)		(13,561)	593	209	106	(44)	226	350				638	1,567
Income (loss) before provision for income taxes												751	1,603
(Provision for) benefit from income taxes:
Current												248	(3,334)
Deferred												(573)	21,582
Total income tax benefit (expense)												(325)	18,248
Net income (loss)		$ (12,232)	$ 573	$ 357	$ (282)	$ 236	$ 247	$ 225				$ 426	$ 19,851
Earnings Per Share [Abstract]
Earnings (loss) per share - Basic (in dollars per share)		$ (0.93)	$ 0.04	$ 0.03	$ (0.02)	$ 0.02	$ 0.02	$ 0.02				$ 0.03	$ 1.55
Earnings (loss) per share - Diluted (in dollars per share)		$ (0.93)	$ 0.04	$ 0.03	$ (0.02)	$ 0.02	$ 0.02	$ 0.02				$ 0.03	$ 1.51
Revisions | Revision Of Prior Period Financial Statements
Revenue:
Revenues		$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0				$ 0	$ 0
Operating costs and expenses:
Cost of rentals, exclusive of depreciation stated separately below												1,114	82
Depreciation and amortization												31	14
Operating costs and expenses										$ 1,100		1,145	96
Operating income (loss)		(460)	(291)	(354)	(597)	(456)	(47)	(45)				(1,145)	(96)
Income (loss) before provision for income taxes												(1,145)	(96)
(Provision for) benefit from income taxes:
Current												(6)	46
Deferred												259	(7)
Total income tax benefit (expense)												253	39
Net income (loss)		$ (347)	$ (246)	$ (259)	$ (467)	$ (354)	$ (36)	$ (35)			$ 1,130	$ (892)	$ (57)
Earnings Per Share [Abstract]
Earnings (loss) per share - Basic (in dollars per share)		$ (0.03)	$ (0.02)	$ (0.02)	$ (0.04)	$ (0.03)	$ 0	$ (0.01)				$ (0.07)	$ (0.01)
Earnings (loss) per share - Diluted (in dollars per share)		$ (0.03)	$ (0.02)	$ (0.02)	$ (0.04)	$ (0.03)	$ 0	$ (0.01)				$ (0.07)	$ 0

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+ Details

Name:	us-gaap_RevenuesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_RestatementAxis=srt_ScenarioPreviouslyReportedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RestatementAxis=srt_RestatementAdjustmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementByRestatementPeriodAndAmountAxis=ngs_RevisionOfPriorPeriodFinancialStatementsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: