Unaudited Condensed Consolidated Statements of Changes In Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Treasury Stock [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 employee share awards	1,111		1,111
Restricted stock vesting	(262)			$ (262)
Restricted stock vesting (in shares)		(51,933)		51,933
Sale of Windcat Workboats	(4,201)				(4,201)
Net (loss) income	6,011				6,011
Other comprehensive income	4,656					4,656
Balance at Mar. 31, 2021	409,159	$ 243	452,290	$ (1,110)	(50,029)	7,446	319
Balance (in shares) at Mar. 31, 2021		24,194,383		125,217
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	$ 7	$ 7
Restricted stock grants (in shares)		733,895
Amortization of employee share awards	1,067		1,067
Exercise of options	$ 140		140
Exercise of options (in shares)	31,992	31,992
Restricted stock vesting	$ (672)			$ (672)
Restricted stock vesting (in shares)	(114,251)	(114,251)		114,251
Net (loss) income	$ (14,837)				(14,837)
Other comprehensive income	798					798
Balance at Mar. 31, 2022	$ 433,044	$ 269	$ 463,138	$ (1,792)	$ (37,744)	$ 8,853	$ 320
Balance (in shares) at Mar. 31, 2022	26,886,011	26,643,873		242,138