Note 3 - Revenue from Contracts with Customers (Tables)

3 Months Ended

Mar. 31, 2021

Notes Tables

Revenue from External Customers by Geographic Areas [Table Text Block]

	Three Months Ended March 31,
	2021		2020
Europe	$	4,366	$	7,472
Latin America		3,503		20,062
Asia Pacific		2,201		7,763
Africa		1,772		12,240
North America		1,208		3,888
Middle East		727		954
Other		259		4,035
Total	$	14,036	$	56,414

Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block]

	March 31,		December 31,
	2021		2020
New Venture	$	1,212	$	9,158
Imaging and Reservoir Services		1,287		680
Devices		1,586		1,424
Total	$	4,085	$	11,262

Unbilled receivables at December 31, 2020	$	11,262
Recognition of unbilled receivables (a)		13,612
Revenues billed to customers (a)		(20,789	)
Unbilled receivables at March 31, 2021	$	4,085

	March 31,		December 31,
	2021		2020
New Venture	$	2,158	$	2,169
Imaging and Reservoir Services		672		665
Devices		622		48
Optimization Software & Services		1,002		766
Total	$	4,454	$	3,648

Deferred revenue at December 31, 2020	$	3,648
Cash collected in excess of revenue recognized		1,230
Recognition of deferred revenue		(424	)
Deferred revenue at March 31, 2021	$	4,454