Unaudited Condensed Consolidated Statements of Changes In Equity - USD ($) $ in Thousands	Total	Director [Member]	Common Stock [Member]	Common Stock [Member] Director [Member]	Additional Paid-In Capital [Member]	Additional Paid-In Capital [Member] Director [Member]	Treasury Stock [Member]	Treasury Stock [Member] Director [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income [Member]	Non-Controlling Interests In Subsidiaries [Member]
Balance at Dec. 31, 2020	$ 401,836		$ 235		$ 451,179		$ (848)		$ (51,839)	$ 2,790	$ 319
Balance (in shares) at Dec. 31, 2020			23,430,766				73,284
Restricted stock grants	8		$ 8
Restricted stock grants (in shares)			815,550
Amortization of share awards	3,759				3,759
Restricted stock vesting	(272)						$ (272)
Restricted stock vesting (in shares)			(54,454)				54,454
Director share awards		$ 437		$ 2		$ 435
Director share awards (in shares)				189,030
Forfeiture of employee share awards (in shares)			(5,250)
Sale Of Windcat Workboats	(4,202)								(4,202)
Net loss (income)	48,983								48,982		1
Other comprehensive income (loss)	4,254									4,254
Balance at Sep. 30, 2021	454,803		$ 245		455,373		$ (1,120)		(7,059)	7,044	320
Balance (in shares) at Sep. 30, 2021			24,375,642				127,738
Balance at Jun. 30, 2021	459,401		$ 245		454,079		$ (1,120)		(1,230)	7,107	320
Balance (in shares) at Jun. 30, 2021			24,380,892				127,738
Amortization of share awards	1,294				1,294
Forfeiture of employee share awards (in shares)			(5,250)
Net loss (income)	(5,829)								(5,829)
Other comprehensive income (loss)	(63)									(63)
Balance at Sep. 30, 2021	454,803		$ 245		455,373		$ (1,120)		(7,059)	7,044	320
Balance (in shares) at Sep. 30, 2021			24,375,642				127,738
Balance at Dec. 31, 2021	$ 446,541		$ 262		461,931		$ (1,120)		(22,907)	8,055	320
Balance (in shares) at Dec. 31, 2021	26,120,124		25,992,237				127,887
Restricted stock grants	$ 9		$ 9
Restricted stock grants (in shares)			738,896
Amortization of share awards	3,367				3,367
Exercise of options	$ 151				151
Exercise of options (in shares)	34,492		34,492
Restricted stock vesting	$ (672)	(60)					$ (672)	$ (60)
Restricted stock vesting (in shares)	(120,751)		(114,251)	(6,500)			114,251	6,500
Director share awards		$ 1		$ 1
Director share awards (in shares)				60,787
Forfeiture of employee share awards (in shares)			(3,500)
Net loss (income)	$ (58,307)								(58,308)		1
Other comprehensive income (loss)	(2,060)								1,446	(3,506)
Balance at Sep. 30, 2022	$ 388,970		$ 272		465,449		$ (1,852)		(79,769)	4,549	321
Balance (in shares) at Sep. 30, 2022	26,950,799		26,702,161				248,638
Balance at Jun. 30, 2022	$ 413,507		$ 272		464,222		$ (1,852)		(55,418)	5,960	323
Balance (in shares) at Jun. 30, 2022			26,705,661				248,638
Amortization of share awards	1,227				1,227
Forfeiture of employee share awards (in shares)			(3,500)
Net loss (income)	(24,353)								(24,351)		(2)
Other comprehensive income (loss)	(1,411)									(1,411)
Balance at Sep. 30, 2022	$ 388,970		$ 272		$ 465,449		$ (1,852)		$ (79,769)	$ 4,549	$ 321
Balance (in shares) at Sep. 30, 2022	26,950,799		26,702,161				248,638