Note 14 - Segment and Geographic Distribution of Operations - Segment Reporting Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenue	$ 1,009,985	$ 647,684	$ 371,033
Corporate expenses	827,770	620,976	466,049
Gain (loss) on asset dispositions, net	8,701	250	(2,901)
Affiliate credit loss impairment expense	0	0	(400)
Long-lived asset impairments and other	0	(714)	(15,643)
Operating income (loss)	182,215	26,708	(95,016)
Depreciation and amortization	180,331	119,160	114,544
Property Plant And Equipment Additions	45,852	16,637	8,951
Total Assets	2,062,774	1,297,656	1,095,780
Vessel [Member]
Revenue	998,993	641,404	361,569
Product and Service, Other [Member]
Revenue	10,992	6,280	9,464
Operating Segments [Member]
Gross Profit	219,168	80,755	(39,164)
Operating Segments [Member] | Vessel [Member]
Gross Profit	212,518	76,605	(46,397)
Operating Segments [Member] | Product and Service, Other [Member]
Revenue	10,992	6,280	9,464
Gross Profit	6,650	4,150	7,233
Operating Segments [Member] | Americas [Member]
Depreciation and amortization	41,215	29,920	30,856
Property Plant And Equipment Additions	2,916	4,468	0
Total Assets	418,151	309,985	278,394
Operating Segments [Member] | Americas [Member] | Vessel [Member]
Revenue	237,205	146,871	102,151
Gross Profit	42,964	12,016	(11,270)
Operating Segments [Member] | Asia Pacific [Member]
Depreciation and amortization	10,669	5,960	4,484
Property Plant And Equipment Additions	7,839	317	(42)
Total Assets	167,085	148,684	28,564
Operating Segments [Member] | Asia Pacific [Member] | Vessel [Member]
Revenue	122,235	64,231	18,142
Gross Profit	38,471	3,726	4,896
Operating Segments [Member] | Middle East [Member]
Depreciation and amortization	26,566	24,236	21,508
Property Plant And Equipment Additions	3,016	3,911	0
Total Assets	191,927	197,054	154,723
Operating Segments [Member] | Middle East [Member] | Vessel [Member]
Revenue	135,375	110,375	84,395
Gross Profit	(1,051)	(1,093)	(6,070)
Operating Segments [Member] | Europe and Mediterranean [Member]
Depreciation and amortization	63,152	27,734	28,163
Property Plant And Equipment Additions	7,320	1,302	764
Total Assets	671,626	282,670	293,760
Operating Segments [Member] | Europe and Mediterranean [Member] | Vessel [Member]
Revenue	230,217	129,578	80,914
Gross Profit	33,687	18,844	(16,968)
Operating Segments [Member] | West Africa [Member]
Depreciation and amortization	36,508	28,534	26,196
Property Plant And Equipment Additions	19,593	2,923	6,341
Total Assets	421,054	285,965	223,988
Operating Segments [Member] | West Africa [Member] | Vessel [Member]
Revenue	273,961	190,349	75,967
Gross Profit	98,447	43,112	(16,985)
Corporate, Non-Segment [Member]
Corporate expenses	(45,654)	(53,583)	(36,908)
Depreciation and amortization	2,221	2,776	3,337
Property Plant And Equipment Additions	5,168	3,716	1,888
Total Assets	$ 192,931	$ 73,298	$ 116,351