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Note 7 - Debt (Details Textual) - USD ($) $ in Thousands |  |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
May 06, 2021 | Mar. 18, 2021 | Jun. 30, 2021 | Aug. 06, 2023 | Aug. 06, 2022
ABN Bank [Member] | Eco West Coast [Member] |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 36,800 |  |  |
Debt Instrument, Periodic Payment, Total |  | 615 |  |  |
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid | $ 21,500 | $ 22,040 |  |  |
Debt Instrument, Net Asset Cover Ratio |  | 125.00% |  |  |
Total Debt To Market Adjusted Total Assets Ratio Percentage | 75.00% | 75.00% |  |  |
Minimum Free Liquidity, Per Collaterlized Vessel |  | $ 500 |  |  |
Debt Instrument, Covenant, Market Adjusted Total Assets Minus Total Liabilities, Minimum |  | $ 60,000 |  |  |
Debt Instrument, Net Asset Cover Ratio, Year Three | 125.00% |  |  |  |
Minimum Free Liquidity, Per Bareboated Charter-in Vessel | $ 500 |  |  |  |
ABN Bank [Member] | Eco West Coast [Member] | Forecast [Member] |  |  |  |  |
Debt Instrument, Periodic Payment, Total |  |  |  | $ 625 | $ 750
Nord/ LB Bank [Member] |  |  |  |  |
Long-term Line of Credit, Total |  |  | $ 173,617 |  |
ABN Bank Facility [Member] | Eco Malibu [Member] |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 38,000 |  |  |  |
London Interbank Offered Rate (LIBOR) [Member] | ABN Bank [Member] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 0.096% |  |
London Interbank Offered Rate (LIBOR) [Member] | ABN Bank [Member] | Eco West Coast [Member] |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 2.50% | 3.00% |  |

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- Definition The minimum requirement of market adjusted total assets of the Company minus total liabilities. + References No definition available. + Details
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- Definition Represents the ratio of cover for net assets in 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 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 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 Amount of the required periodic payments including both interest and principal payments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123599511&loc=d3e64711-112823 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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