Note 9 - Details of Selected Balance Sheet Accounts - Changes in Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Balance	$ 19,565	$ 23,585	$ 23,585
Impairment of goodwill	0	(4,150)	(4,150)
Impact of foreign currency translation adjustments	208		130
Balance	19,773		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
Operations Optimization [Member]
Balance	16,622	20,642	20,642
Impairment of goodwill	0	$ (4,200)	(4,150)
Impact of foreign currency translation adjustments	208		130
Balance	$ 16,830		$ 16,622