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Note 5 - Investment in Unconsolidated Affiliates (Tables)

12 Months Ended

Dec. 31, 2020

Notes Tables

Schedule of Related Party Transactions [Table Text Block]

		December 31,				December 31,
(in thousands)		2020				2019
Due from affiliates:
Angolan joint venture (Sonatide)		$	41,623			$	89,246
Nigerian joint venture (DTDW)			20,427				36,726
			62,050				125,972
Due to affiliates:
Sonatide		$	32,767			$	31,475
DTDW			20,427				18,711
			53,194				50,186
Due from affiliates, net of due to affiliates		$	8,856			$	75,786

Schedule of Amounts Due From Affiliate [Table Text Block]

		Year Ended December 31,
(In thousands)		2020				2019				2018
Due from Sonatide at beginning of year		$	89,246			$	109,176			$	230,315
Revenue earned by the company through Sonatide			44,254				52,372				56,916
Less amounts received from Sonatide			(36,160	)			(60,486	)			(76,878	)
Less amounts used to offset Due to Sonatide obligations (A)			(11,848	)			(10,551	)			(78,993	)
Less impairment of due from affiliate			(40,900	)			—				(20,083	)
Other			(2,969	)			(1,265	)			(2,101	)
		$	41,623			$	89,246			$	109,176

		Year Ended December 31,
(In thousands)		2020				2019				2018
Due to Sonatide at beginning of year		$	31,475			$	29,347			$	99,448
Plus commissions payable to Sonatide			4,152				4,937				5,502
Plus amounts paid by Sonatide on behalf of the company			9,037				9,654				14,778
Less commissions paid to Sonatide			—				(5,961	)			(13,906	)
Less amounts used to offset Due from Sonatide obligations (A)			(11,848	)			(10,551	)			(78,993	)
Other			(49	)			4,049				2,518
		$	32,767			$	31,475			$	29,347