Note 9 - Details of Selected Balance Sheet Accounts - Changes in Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Balance			$ 19,565	$ 23,585	$ 23,585
Impairment of goodwill	$ 0	$ 0	0	(4,150)	(4,150)
Impact of foreign currency translation adjustments			333		130
Balance	19,898		19,898		19,565
E and P Technology and Services [Member]
Balance			2,943	2,943	2,943
Impairment of goodwill			0	0	0
Impact of foreign currency translation adjustments			0		0
Balance	2,943		2,943		2,943
Operations Optimization [Member]
Balance			16,622	20,642	20,642
Impairment of goodwill			0	$ (4,200)	(4,150)
Impact of foreign currency translation adjustments			333		130
Balance	$ 16,955		$ 16,955		$ 16,622