Note 2 - Segment and Geographic Information - Summary of Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Net revenues	$ 14,036	$ 56,414
Gross profit (loss)	$ 859	$ 28,344
Gross margin	6.00%	50.00%
Loss from operations	$ (10,234)	$ 6,326
Interest expense, net	(3,262)	(3,221)
Other income (expense), net	(607)	429
Income (loss) before income taxes	(14,103)	3,534
Operating Segments [Member] | E and P Technology and Services [Member]
Net revenues	7,236	46,514
Gross profit (loss)	$ (1,607)	$ 23,730
Gross margin	(22.00%)	51.00%
Loss from operations	$ (4,853)	$ 17,952	[1]
Operating Segments [Member] | E and P Technology and Services [Member] | New Venture [Member]
Net revenues	1,087	1,441
Operating Segments [Member] | E and P Technology and Services [Member] | Data Library [Member]
Net revenues	2,484	40,131
Operating Segments [Member] | E and P Technology and Services [Member] | Multi-client [Member]
Net revenues	3,571	41,572
Operating Segments [Member] | E and P Technology and Services [Member] | Imaging and Resevoir Services [Member]
Net revenues	3,665	4,942
Operating Segments [Member] | Operations Optimization [Member]
Net revenues	6,800	9,900
Gross profit (loss)	$ 2,466	$ 4,614
Gross margin	36.00%	47.00%
Loss from operations	$ (820)	$ (3,259)	[2]
Operating Segments [Member] | Operations Optimization [Member] | Optimization Software and Services [Member]
Net revenues	2,844	4,427
Operating Segments [Member] | Operations Optimization [Member] | Devices [Member]
Net revenues	3,956	5,473
Segment Reconciling Items [Member]
Loss from operations	$ (4,561)	$ (8,367)

[1] Includes impairment of multi-client data library of $1.2 million for the three months ended March 31, 2020.

[2] Includes impairment of goodwill of $4.2 million for the three months ended March 31, 2020.