Consolidated Statements of Changes In Equity - USD ($) $ in Thousands	Total	Previously Reported [Member]	Revision of Prior Period, Accounting Standards Update, Adjustment [Member]	Common Stock [Member]	Common Stock [Member] Previously Reported [Member]	Additional Paid-in Capital [Member]	Additional Paid-in Capital [Member] Previously Reported [Member]	Treasury Stock [Member]	Treasury Stock [Member] Previously Reported [Member]	Retained Earnings [Member]	Retained Earnings [Member] Previously Reported [Member]	Retained Earnings [Member] Revision of Prior Period, Accounting Standards Update, Adjustment [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Accumulated Other Comprehensive Income (Loss) [Member] Previously Reported [Member]	Non-Controlling Interests In Subsidiaries [Member]	Non-Controlling Interests In Subsidiaries [Member] Previously Reported [Member]
Balance at Dec. 31, 2018	$ 565,351	$ 554,935	$ 10,416	$ 204	$ 204	$ 415,372	$ 415,372	$ (91)	$ (91)	$ 137,250	$ 126,834	$ 10,416	$ (16,788)	$ (16,788)	$ 29,404	$ 29,404
Balance (in shares) at Dec. 31, 2018				20,439,208	20,439,208			4,007	4,007
Issuance of common stock	6,596			$ 7		6,589
Issuance of Common Stock (in shares)				653,872
Restricted stock grants	2			$ 2
Restricted stock grants (in shares)				245,400
Cancellation of restricted stock grants (in shares)				(2,200)
Amortization of employee share awards	5,046					5,046
Exercise of options	1,421			$ 1		1,420
Exercise of options (in shares)				113,750
Exercise of warrants	3			$ 4				$ (1)
Exercise of Warrants (in shares)				444,391
Restricted stock vesting	(579)					(2)		$ (577)
Restricted stock vesting (in shares)				(43,129)				43,129
Director share awards	894			$ 1		893
Director share awards (in shares)				30,197				49
Acquisition of consolidated joint venture	(2,114)														(2,114)
Sale of Standby Safety Fleet	(17,399)									(17,399)
Dissolution of entity	62									62
Net Income (Loss)	(98,695)									(92,837)					(5,858)
Other comprehensive income	18,336												18,336
Balance at Dec. 31, 2019		$ 478,924			$ 219		$ 429,318		$ (669)		$ 27,076		1,548	$ 1,548		$ 21,432
Balance (in shares) at Dec. 31, 2019					21,881,489				47,185
Restricted stock grants	3			$ 3
Restricted stock grants (in shares)				289,452
Cancellation of grants and options	101					101
Cancellation of grants and options (in shares)				(12,650)
Amortization of employee share awards	$ 3,969					3,969
Exercise of options (in shares)	0
Exercise of warrants	$ 2			$ 3				$ (1)
Exercise of Warrants (in shares)				338,320				354
Restricted stock vesting	(178)							$ (178)
Restricted stock vesting (in shares)				(25,745)				25,745
Director share awards	755			$ 1		754
Director share awards (in shares)				59,900
Acquisition of consolidated joint venture				$ 9		17,037									(17,046)
Acquisition of consolidated joint venture (in shares)				900,000
Net Income (Loss)	(82,982)									(78,915)					(4,067)
Other comprehensive income	1,242												1,242
Balance at Dec. 31, 2020	$ 401,836			$ 235		451,179		$ (848)		(51,839)			2,790		319
Balance (in shares) at Dec. 31, 2020	23,504,050			23,430,766				73,284
Restricted stock grants	$ 8			$ 8
Restricted stock grants (in shares)				815,550
Cancellation of restricted stock grants (in shares)				(5,250)
Amortization of employee share awards	$ 5,002					5,002
Exercise of options (in shares)	0
Exercise of warrants	$ 1			$ 1
Exercise of Warrants (in shares)				48,809
Restricted stock vesting	(272)							$ (272)
Restricted stock vesting (in shares)				(54,603)				54,603
Director share awards	437			$ 2		435
Director share awards (in shares)				189,030
Acquisition of 50% or less owned company	5,331			$ 16		5,315
Acquisition of 50% or less owned company (in shares)				1,567,935
Sale of Windcat Workboats	(4,204)									(4,204)
Net Income (Loss)	33,137									33,136					1
Other comprehensive income	5,265												5,265
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