Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Revenues	$ 68,483	$ 90,376
Costs of services	60,528	80,353
Gross margin	7,955	10,023
General and administrative	5,940	6,231
Depreciation, amortization and accretion	1,208	1,104
(Losses) Gains on asset disposals, net	(12)	(21)
Operating income (loss)	819	2,709
Interest expense, net	(1,124)	(1,311)
Gains (losses) on foreign currency	(457)	101
Other, net	105	88
Net income (loss) before income tax expense	(657)	1,587
Total assets	175,558		$ 157,342
Pipeline Inspection [Member]
Revenues	63,895	86,229
Costs of services	57,523	77,858
Gross margin	6,372	8,371
General and administrative	4,518	4,606
Depreciation, amortization and accretion	556	555
Operating income (loss)	1,298	3,210
Total assets	105,401		114,858
Pipeline & Process Services [Member]
Revenues	2,922	1,974
Costs of services	2,361	1,719
Gross margin	561	255
General and administrative	640	596
Depreciation, amortization and accretion	145	143
(Losses) Gains on asset disposals, net	(26)	(21)
Operating income (loss)	(198)	(463)
Total assets	12,717		14,318
Environmental Services [Member]
Revenues	1,666	2,173
Costs of services	644	776
Gross margin	1,022	1,397
General and administrative	557	766
Depreciation, amortization and accretion	411	402
(Losses) Gains on asset disposals, net	14
Operating income (loss)	40	229
Total assets	20,236		21,911
Other [Member]
General and administrative	225	263
Depreciation, amortization and accretion	96	4
Operating income (loss)	(321)	$ (267)
Total assets	$ 37,204		$ 6,255