Unaudited Condensed Consolidated Statements of Changes In Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings Accumulated Deficit [Member]	Accumulated Other Comprehensive Loss [Member]	Non-Controlling Interests In Subsidiaries [Member]
Balance at Dec. 31, 2019	$ 478,924	$ 219	$ 429,318	$ (669)	$ 27,076	$ 1,548	$ 21,432
Balance (in shares) at Dec. 31, 2019		21,881,487		47,187
Issuance of Common Stock	3,358	$ 9	3,349
Issuance of Common Stock (in shares)		900,000
Cancellation of employee share awards (in shares)		(1,497)
Restricted stock grants	3	$ 3
Restricted stock grants (in shares)		271,950
Amortization of employee share awards	1,069		1,069
Restricted stock vesting	(175)			$ (175)
Restricted stock vesting (in shares)		(24,715)		24,715
Acquisition of consolidated joint venture	(3,357)		13,689				(17,046)
Net Income (loss)	(19,992)				(15,945)		(4,047)
Other comprehensive income (loss)	(4,519)					(4,519)
Balance at Mar. 31, 2020	455,311	$ 231	447,425	$ (844)	11,131	(2,971)	339
Balance (in shares) at Mar. 31, 2020		23,027,225		71,902
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
Amortization of employee share awards	1,111		1,111
Restricted stock vesting	$ (262)			$ (262)
Restricted stock vesting (in shares)	(51,933)	(51,933)		51,933
Sale of Windcat Workboats	$ (4,201)				(4,201)
Net Income (loss)	6,011				6,011
Other comprehensive income (loss)	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	24,319,600	24,194,383		125,217