Note 5 - Investment in Unconsolidated Affiliates (Tables)

12 Months Ended

Dec. 31, 2022

Notes Tables

Schedule of Related Party Transactions [Table Text Block]

(In Thousands)	December 31,		December 31,
	2022		2021
Due from affiliates:
Angolan joint venture (Sonatide)	$	—	$	49,011
Nigerian joint venture (DTDW)		—		21,123
		—		70,134
Due to affiliates:
Sonatide	$	—	$	40,432
DTDW		—		21,123
		—		61,555
Due from affiliates, net of due to affiliates	$	—	$	8,579

Schedule of Amounts Due From Affiliate [Table Text Block]

(In Thousands)	Year Ended December 31,
	2022			2021			2020
Due from Sonatide at beginning of year	$	49,011		$	41,623		$	89,246
Revenue earned by the company through Sonatide		—			41,775			44,254
Less amounts received from Sonatide		—			(26,429	)		(36,160	)
Less amounts used to offset Due to Sonatide obligations (A)		—			(8,530	)		(11,848	)
Less impairment of due from affiliate		—			(400	)		(40,900	)
Write off of due from affiliate in connection with the acquisition		(49,011	)		—			—
Other		—			972			(2,969	)
	$	—		$	49,011		$	41,623

Schedule of Amoutns Due to Affiliate [Table Text Block]

(In Thousands)	Year Ended December 31,
	2022			2021			2020
Due to Sonatide at beginning of year	$	40,432		$	32,767		$	31,475
Plus commissions payable to Sonatide		—			3,832			4,152
Plus amounts paid by Sonatide on behalf of the company		—			10,914			9,037
Less amounts used to offset Due from Sonatide obligations (A)		—			(8,530	)		(11,848	)
Write off of due to affiliate in connection with the acquisition		(40,432	)		—			—
Other		—			1,449			(49	)
	$	—		$	40,432		$	32,767