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Note 4 - Indebtedness - Schedule of Debt (Details) - Troms Offshore [Member] kr in Thousands, $ in Thousands	Dec. 31, 2020 USD ($)	Dec. 31, 2020 NOK (kr)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 NOK (kr)
NOK Denominated Notes Due May 2024 [Member]
Amount outstanding	$ 5,954	kr 51,120	$ 10,260	kr 89,460
NOK Denominated Notes Due May 2024 [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value in U.S. dollar equivalent (Level 2)	5,954		10,259
NOK Denominated Notes Due January 2026 [Member]
Amount outstanding	14,559	kr 125,000	20,788	kr 181,250
NOK Denominated Notes Due January 2026 [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value in U.S. dollar equivalent (Level 2)	14,789		20,792
USD Denominated Notes Due January 2027 [Member]
Amount outstanding	14,744		20,273
USD Denominated Notes Due January 2027 [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value in U.S. dollar equivalent (Level 2)	15,040		20,278
USD Denominated Notes Due April 2027 [Member]
Amount outstanding	15,669		21,545
USD Denominated Notes Due April 2027 [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value in U.S. dollar equivalent (Level 2)	$ 15,775		$ 21,546

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- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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