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Note 4 - Indebtedness (Details Textual) $ in Thousands, kr in Millions	1 Months Ended	12 Months Ended				36 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 NOK (kr)	Nov. 30, 2020 USD ($)	Sep. 30, 2020 USD ($)	Nov. 30, 2019 USD ($)	Jan. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)	Feb. 28, 2018 USD ($)	Jul. 31, 2017
Restricted Cash, Current	$ 2,079	$ 2,079	$ 5,755
Gain (Loss) on Extinguishment of Debt, Total		0	$ 0	$ (8,119)
Gulf Mark Offshore Inc [Member] | Gulf Mark Term Loan Facility [Member]
Repayments of Debt				100,000
Gain (Loss) on Extinguishment of Debt, Total				8,100
Senior Notes [Member] | Troms Offshore [Member] | Plan Of Reorganization [Member]
Percentage Of Required Principal Payments Due From Effective Date													50.00%
Number Of Vessels Mortgaged													6
Debt Instrument, Covenant, Obligation to Prepay, Additional Amount, Maximum	45,000	45,000
Repayments of Long-term Debt, Total	12,500
Senior Notes [Member] | Troms Offshore [Member] | Plan Of Reorganization [Member] | Current Portion of long-term Debt [Member]
Long-Term Debt, Maturity, Year One	22,800	22,800
Tender Offer [Member]
Debt Instrument, Repurchased Face Amount									$ 125,000
Premium Paid On Debt Repurchase									8.50%
Debt Instrument, Repurchase Amount									$ 135,600
Cost Associated With Debt Modification									$ 11,400
Tender Offer [Member] | Senior Notes [Member] | Maximum [Member]
Debt Instrument, Face Amount				$ 25,400								$ 24,700
The 8.00% Senior Secured Notes due August 2022 [Member]
Debt Instrument, Face Amount	$ 350,000	$ 350,000								$ 100	$ 40
Debt Instrument, Interest Rate, Stated Percentage	8.00%	8.00%	8.00%
Debt Instrument, Repurchased Face Amount							$ 50,000	$ 27,700
Debt Instrument, Repurchase Amount							50,300
Debt Instrument, Repurchase Premium (Discount) Amount							$ 600
The 8.00% Senior Secured Notes due August 2022 [Member] | Tender Offer [Member]
Percentage Of Proceeds From Asset Sales Net Of Commission Paid													65.00%
The 8.00% Senior Secured Notes due August 2022 [Member] | Fair Value, Inputs, Level 2 [Member]
Debt Instrument, Fair Value Disclosure, Total	$ 141,400	$ 141,400
NOK Denominated Notes Due May 2024 and January 2026 [Member] | Troms Offshore [Member]
Debt Instrument, Term (Year)						12 years
NOK Denominated Notes Due January 2026 [Member] | Troms Offshore [Member]
Debt Instrument, Face Amount | kr						kr 504.4
NOK Denominated Notes Due January 2026 [Member] | Fair Value, Inputs, Level 2 [Member] | Troms Offshore [Member]
Debt Instrument, Fair Value Disclosure, Total	14,789	14,789	$ 20,792
USD Denominated Notes Due January 2027 [Member] | Troms Offshore [Member]
Debt Instrument, Face Amount					$ 60,800
Debt Instrument, Term (Year)					12 years
USD Denominated Notes Due January 2027 [Member] | Maximum [Member] | Troms Offshore [Member]
Capitalization Rate					6.13%
USD Denominated Notes Due January 2027 [Member] | Minimum [Member] | Troms Offshore [Member]
Capitalization Rate					4.56%
USD Denominated Notes Due January 2027 [Member] | Fair Value, Inputs, Level 2 [Member] | Troms Offshore [Member]
Debt Instrument, Fair Value Disclosure, Total	$ 15,040	$ 15,040	$ 20,278

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