The amount of bareboat charter hire expenses per day for years five through ten of an agreement.

No definition available.

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- Definition

The amount of bareboat charter hire expenses per day for the first five years of an agreement.

+ References

No definition available.

+ Details

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- Definition

Represents charter rate per day.

+ References

No definition available.

+ Details

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- Definition

Represents charter rate per quarter per vessel.

+ References

No definition available.

+ Details

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- Definition

Represents charter term.

+ References

No definition available.

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- Definition

The amount of total net debt to fleet value, expressed as a percentage, pursuant to certain debt covenants.

+ References

No definition available.

+ Details

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- Definition

The minimum common shares outstanding percentage ownership an individual is required to retain in the entity in the event of a default on a debt instrument.

+ References

No definition available.

+ Details

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- Definition

The minimum voting right interest percentage an individual is required to retain in the entity in the event of a default on a debt instrument.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Represents the ratio of cover for net assets in a credit facility covenant.

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

The ratio of cover for net assets, thereafter, in a credit facility covenant.

+ References

No definition available.

+ Details

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- Definition

The ratio of cover for net assets in the first year of a credit facility covenant.

+ References

No definition available.

+ Details

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- Definition

The ratio of cover for net assets in the third year of a credit facility covenant.

+ References

No definition available.

+ Details

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- Definition

The ratio of cover for net assets in the second year of a credit facility covenant.

+ References

No definition available.

+ Details

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- Definition

The number of monthly installments for a debt instrument.

+ References

No definition available.

+ Details

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- Definition

Amount increased to periodic payment pursuant to the debt agreement.

+ References

No definition available.

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- Definition

The amount increased to balloon payment to be paid pursuant to the debt agreement.

+ References

No definition available.

+ Details

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- Definition

Represents the percent of fixed charges measured against EBITDA.

+ References

No definition available.

+ Details

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- Definition

The increase (decrease) of the maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

No definition available.

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- Definition

The percentage of increase of the margin in a debt issuance.

+ References

No definition available.

+ Details

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- Definition

Represents the market value adjusted net worth.

+ References

No definition available.

+ Details

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- Definition

The amount of minimum free liquidity required per bareboated chartered-in vessel, by certain debt covenants.

+ References

No definition available.

+ Details

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- Definition

The minimum amount of free liquidity per bareboated chartered-in vessel required from a credit facility's covenants.

+ References

No definition available.

+ Details

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- Definition

The minimum amount of free liquidity per collateralized vessel required from a credit facility's covenants.

+ References

No definition available.

+ Details

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- Definition

Represents the number of consecutive quarterly installments.

+ References

No definition available.

+ Details

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- Definition

Number of vesselssold

+ References

No definition available.

+ Details

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- Definition

Represents the amount of the buy back option associated with a sale leaseback transaction.

+ References

No definition available.

+ Details

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- Definition

Term of the sale leaseback arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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- Definition

The percentage of total debt to market-adjusted total assets ratio required in a credit facility's covenants.

+ References

No definition available.

+ Details

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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- Definition

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

+ References

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- Definition

Amount of the required periodic payments applied to principal.

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- Definition

Amount of payment greater than the preceding installment payments to be paid at final maturity date of debt.

+ References

No definition available.

+ Details

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- Definition

Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.

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The increase (decrease) during the reporting period in the value of expenditures made during the current reporting period for benefits that will be received over a period of years. Deferred charges differ from prepaid expenses in that they usually extend over a long period of time and may or may not be regularly recurring costs of operation.

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- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

+ Details

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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- Definition

Amount of the required periodic payments of both interest and principal.

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- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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- Definition

Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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- Definition

The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition

Amount of cash inflow before closing and debt issuance costs received by a seller-lessee in a sale-leaseback recognized in investing activities.

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Note 7 - Debt (Details Textual)																																					12 Months Ended
Note 7 - Debt (Details Textual)	Dec. 10, 2020 USD ($)	Dec. 01, 2020 USD ($)	Nov. 09, 2020 USD ($)	Nov. 03, 2020 USD ($)	Oct. 29, 2020 USD ($)	Oct. 14, 2020 USD ($)	Mar. 19, 2020 USD ($)	Feb. 21, 2020 USD ($)	Jan. 21, 2020 USD ($)	Jan. 21, 2020 USD ($)	Jan. 14, 2020 USD ($)	Nov. 20, 2019 USD ($)	Nov. 18, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jul. 15, 2019 USD ($)	Jul. 08, 2019 USD ($)	Apr. 23, 2019 USD ($)	Jan. 28, 2019 USD ($)	Jan. 17, 2019 USD ($)	Dec. 21, 2018 USD ($)	Dec. 03, 2018 USD ($)	Nov. 16, 2018 USD ($)	Sep. 04, 2018 USD ($)	Jun. 29, 2018 USD ($)	May 06, 2018	May 05, 2018	Sep. 05, 2017 USD ($)	Apr. 21, 2017	Feb. 24, 2017 USD ($)	Aug. 05, 2016 USD ($)	Aug. 01, 2016 USD ($)	Jul. 20, 2016 USD ($)	Jan. 15, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 28, 2015 USD ($)	Jul. 13, 2015 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 20, 2019	Jul. 09, 2015 USD ($)
Payments to Acquire Property, Plant, and Equipment, Total																																					$ (0)	$ 48,140,000	$ (0)
Increase (Decrease) in Deferred Charges																																					1,115,000	$ 6,773,000
Fair Value, Inputs, Level 2 [Member]
Debt Instrument, Fair Value Disclosure, Total																																					$ 107,833,000
M/T Eco Marina Del Ray [Member]
Sale Leaseback Transaction, Lease Term (Year)																								5 years
Charter Rate Per Day																								$ 8,600
Sale Leaseback Transaction, Buy Back, Amount																								22,680,000
Proceeds from Sale of Property, Plant, and Equipment, Total																								$ 32,387,000
MT Eco Fleet [Member]
Proceeds from Sale of Property, Plant, and Equipment, Total										$ 21,000,000	$ 23,000,000
M/T Nord Valiant [Member]
Charter Rate Per Day																				$ 5,875
Charter Term (Year)																				5 years
Sale Leaseback Transaction, Gross Proceeds, Investing Activities																				$ 21,655,000
M/T Eco California [Member]
Charter Rate Per Day																				$ 6,550
Proceeds from Sale of Property, Plant, and Equipment, Total			$ 22,520,000
Charter Term (Year)																				7 years
Sale Leaseback Transaction, Gross Proceeds, Investing Activities																				$ 24,140,000
Gain (Loss) on Disposition of Property Plant Equipment, Total			$ (674,000)
M/T Eco Bel Air and M/T Eco Beverly Hills [Member]
Charter Term (Year)																					7 years
Sale Leaseback Transaction, Gross Proceeds, Investing Activities																					$ 91,412,000
Charter Rate Per Quarter																					$ 1,475
M/T Eco Beverly Hills [Member]
Gain (Loss) on Disposition of Property Plant Equipment, Total		$ (806,000)
Payments to Acquire Property, Plant, and Equipment, Total		$ 41,281,000
M/T Eco Bel Air [Member]
Gain (Loss) on Disposition of Property Plant Equipment, Total	$ (767,000)
Payments to Acquire Property, Plant, and Equipment, Total	$ 41,281,000
M/T Stenaweco Energy, M/T Stenaweco Evolution, and M/T Stenaweco Excellence [Member] \| Sale and Leaseback Agreements With OFI [Member]
Sale Leaseback Transaction, Lease Term (Year)																10 years
Number of Vessels Sold																																								3
M/T Stenaweco Energy, M/T Stenaweco Evolution, and M/T Stenaweco Excellence [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| Sale and Leaseback Agreements With OFI [Member]
Debt Instrument, Basis Spread on Variable Rate																3.90%
M/T Stenaweco Excellence [Member] \| Sale and Leaseback Agreements With OFI [Member]
Debt Instrument, Periodic Payment, Principal																$ 160,000
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid																$ 6,400,000
Proceeds from Sale of Property, Plant, and Equipment, Total															$ 25,600,000
Debt Instrument, Number of Monthly Installments																120
M/T Stenaweco Energy [Member]
Gain (Loss) on Disposition of Property Plant Equipment, Total					$ (693,000)
Payments to Acquire Property, Plant, and Equipment, Total					$ 19,808,000								$ 2,477,000
M/T Stenaweco Energy [Member] \| Sale and Leaseback Agreements With OFI [Member]
Debt Instrument, Periodic Payment, Principal																$ 131,000
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid																$ 5,700,000
Proceeds from Sale of Property, Plant, and Equipment, Total													$ 21,375,000
Debt Instrument, Number of Monthly Installments																120
M/T Stenaweco Evolution [Member]
Gain (Loss) on Disposition of Property Plant Equipment, Total				$ (790,000)
Payments to Acquire Property, Plant, and Equipment, Total				$ 22,570,000								$ 1,323,000
M/T Stenaweco Evolution [Member] \| Sale and Leaseback Agreements With OFI [Member]
Debt Instrument, Periodic Payment, Principal																$ 153,000
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid																$ 6,100,000
Proceeds from Sale of Property, Plant, and Equipment, Total												$ 24,400,000
Debt Instrument, Number of Monthly Installments																120
M/T SW Excellence [Member]
Gain (Loss) on Disposition of Property Plant Equipment, Total						$ (806,000)
Payments to Acquire Property, Plant, and Equipment, Total						$ 23,040,000
M/T Eco Los Angeles and M/T Eco City of Angels [Member] \| Avic International Leasing Co., Ltd [Member]
Sale Leaseback Transaction, Lease Term (Year)														10 years
Proceeds from Sale of Property, Plant, and Equipment, Total														$ 60,200,000
Bareboat Charter Hire Expenses, Per Day, for the First Five Years														9,435
Bareboat Charter Hire Expenses, Per Day, for Five Through Ten Years														9,090
M/T Eco Los Angeles [Member] \| Avic International Leasing Co., Ltd [Member]
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid														11,288,000
M/T Eco City of Angels [Member] \| Avic International Leasing Co., Ltd [Member]
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid														$ 11,288,000
ABN Bank [Member]
Line of Credit Facility, Maximum Borrowing Capacity																															$ 64,400,000
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid																															$ 9,050,000
Debt Instrument, Default Clause, Minimum Retainable Common Shares Outstanding Percentage																												30.00%
Debt Instrument, Default Clause Minimum Voting Rights Interest, Percentage																												50.00%
Repayments of Lines of Credit									$ 29,475,000										$ 18,550,000
ABN Bank [Member] \| Tranche C First Repayment [Member]
Number of Consecutive Quarterly Installments																															12
Debt Instrument, Periodic Payment, Principal																															$ 550,000
ABN Bank [Member] \| Tranche C Second Repayment [Member]
Number of Consecutive Quarterly Installments																															12
Debt Instrument, Periodic Payment, Principal																															$ 363,000
ABN Bank [Member] \| Tranche C [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate																			3.75%												3.75%
ABN Bank [Member] \| Amended ABN Facility [Member]
Line of Credit Facility, Increase (Decrease) of Maximum Borrowing Capacity																						$ 5,000,000
ABN Bank [Member] \| M/T Eco Fleet and M/T Eco Revolution [Member]
Line of Credit Facility, Maximum Borrowing Capacity																																			$ 44,400,000						$ 42,000,000
Line of Credit Facility, Increase in Margin																																			0.15%
Debt Instrument, Net Asset Cover Ratio																																			130.00%
Total Debt To Market Adjusted Total Assets Ratio Percentage																																			75.00%
Minimum Free Liquidity, Per Collaterlized Vessel																																			$ 750,000
ABN Bank [Member] \| M/T Eco Fleet and M/T Eco Revolution [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate																			3.90%
ABN Bank [Member] \| M/T Eco Fleet and M/T Eco Revolution [Member] \| ABN Amro Facility, First Consecutive Quarterly Installments [Member]
Number of Consecutive Quarterly Installments																																			4
Debt Instrument, Periodic Payment, Principal																																			$ 500,000
ABN Bank [Member] \| M/T Eco Fleet and M/T Eco Revolution [Member] \| ABN Amro Facility, Second Consecutive Quarterly Installments [Member]
Number of Consecutive Quarterly Installments																																			4
Debt Instrument, Periodic Payment, Principal																																			$ 512,500
ABN Bank [Member] \| M/T Eco Fleet and M/T Eco Revolution [Member] \| ABN Amro Facility, Third Consecutive Quarterly Installments [Member]
Number of Consecutive Quarterly Installments																																			4
Debt Instrument, Periodic Payment, Principal																																			$ 525,000
ABN Bank [Member] \| M/T Eco Fleet and M/T Eco Revolution [Member] \| ABN Amro Facility, Fourth Consecutive Quarterly Installments [Member]
Number of Consecutive Quarterly Installments																																			12
Debt Instrument, Periodic Payment, Principal																																			$ 387,500
ABN Bank [Member] \| MT Eco Fleet [Member]
Line of Credit Facility, Maximum Borrowing Capacity																																			22,200,000						21,000,000
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid																																			11,400,000
Proceeds from Lines of Credit, Total																																		$ 1,200,000		$ 21,000,000
ABN Bank [Member] \| MT Eco Fleet [Member] \| Amended ABN Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity																						750,000
Debt Instrument, Periodic Payment, Increased																						25,000
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid, Increased																						475,000
ABN Bank [Member] \| M/T Eco Revolution [Member]
Line of Credit Facility, Maximum Borrowing Capacity																																			$ 22,200,000						$ 21,000,000
Proceeds from Lines of Credit, Total																																	$ 22,200,000
ABN Bank [Member] \| M/T Eco Revolution [Member] \| Amended ABN Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity																						750,000
Debt Instrument, Periodic Payment, Increased																						25,000
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid, Increased																						425,000
ABN Bank [Member] \| M/T Nord Valiant [Member]
Proceeds from Lines of Credit, Total																														$ 20,000,000
ABN Bank [Member] \| M/T Nord Valiant [Member] \| Amended ABN Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity																						3,500,000
Debt Instrument, Periodic Payment, Increased																						100,000
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid, Increased																						$ 2,000,000
Alpha Bank of Greece [Member]
Repayments of Debt								$ 18,950,000
Alpha Bank of Greece [Member] \| M/T Stenaweco Elegance [Member]
Line of Credit Facility, Maximum Borrowing Capacity																																$ 23,350,000
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid																																$ 12,500,000
Proceeds from Lines of Credit, Total																													$ 23,350,000
Debt Instrument, Net Asset Cover Ratio																																125.00%
Total Debt To Market Adjusted Total Assets Ratio Percentage																																75.00%
Minimum Free Liquidity, Per Collaterlized Vessel																																$ 750
EBITDA, Percent of Fixed Charges																																120.00%
Market Value Adjusted Net Worth																																$ 20,000,000
Alpha Bank of Greece [Member] \| M/T Stenaweco Elegance [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate																																3.50%
Alpha Bank of Greece [Member] \| M/T Stenaweco Elegance [Member] \| Alpha Facility, First Consecutive Quarterly Installments [Member]
Number of Consecutive Quarterly Installments																																12
Line of Credit Facility, Periodic Payment																																$ 400,000
Alpha Bank of Greece [Member] \| M/T Stenaweco Elegance [Member] \| Alpha Facility, Second Consecutive Quarterly Installments [Member]
Number of Consecutive Quarterly Installments																																20
Line of Credit Facility, Periodic Payment																																$ 303,000
Alpha Bank [Member]
Repayments of Lines of Credit								$ 938,000
Alpha Bank [Member] \| M/T Stenaweco Elegance [Member]
Line of Credit Facility, Maximum Borrowing Capacity																	$ 1,500,000
Number of Consecutive Quarterly Installments																	8
Debt Instrument, Periodic Payment, Principal																	$ 187,500
Alpha Bank [Member] \| M/T Stenaweco Elegance [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate								4.25%
AT Bank [Member]
Repayments of Debt							$ 21,875,000
AT Bank [Member] \| Predelivery Facility to Fund Hull No 2648 [Member]
Debt Covenant, Ratio of Total Net Debt to Fleet Value																											75.00%
Minimum Free Liquidity, Per Bareboated Chartered-in Vessel																											$ 500,000
AT Bank [Member] \| M/T Eco Palm Desert [Member]
Line of Credit Facility, Maximum Borrowing Capacity																											$ 23,500,000
Number of Consecutive Quarterly Installments																											20
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid																											$ 17,000,000
Total Debt To Market Adjusted Total Assets Ratio Percentage																											75.00%
Minimum Free Liquidity, Per Collaterlized Vessel																											$ 750,000
Line of Credit Facility, Periodic Payment																											$ 325,000
Debt Instrument, Net Asset Cover Ratio, Year One																											115.00%
Debt Instrument, Net Asset Cover Ratio, Year Two																											120.00%
Debt Instrument, Net Asset Cover Ratio, Year Three																											125.00%
Debt Instrument, Net Asset Cover Ratio, Thereafter																											140.00%
Minimum Free Liquidity, Per Bareboated Charter-in Vessel																											$ 500,000
Line of Credit Facility, Commitment Fee Percentage																									1.30%	2.00%	2.00%
AT Bank [Member] \| M/T Eco Palm Desert [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate																											4.00%
AT Bank [Member] \| Pre-delivery Facilities [Member]
Repayments of Lines of Credit																							$ 8,993,000
AT Bank Bridge Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity																		$ 10,500,000
Repayments of Lines of Credit							$ 10,500,000
Line of Credit Facility, Commitment Fee Percentage																		2.25%
AT Bank Bridge Facility [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate																		6.00%