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Note 5 - Transactions With Related Parties - Fees Charged by Related Parties (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018
Central Mare [Member] |  |
Related Party Transaction, Amounts of Transaction | $ 163 | $ 1,183
Central Mare [Member] | Executive Officers and Other Personnel Expenses [Member] | General and Administrative Expense [Member] |  |
Related Party Transaction, Amounts of Transaction | 180 | 1,200
Central Mare [Member] | Amortization of Awarded Shares [Member] | Management Fees Related Party [Member] |  |
Related Party Transaction, Amounts of Transaction | (17) | (17)
Central Shipping Monaco SAM [Member] |  |
Related Party Transaction, Amounts of Transaction |  | 4,625
Central Shipping Monaco SAM [Member] | Management Fees [Member] |  |
Related Party Transaction, Amounts of Transaction |  |
Central Shipping Monaco SAM [Member] | Management Fees [Member] | Management Fees - Related Parties [Member] |  |
Related Party Transaction, Amounts of Transaction |  | 1,159
Central Shipping Monaco SAM [Member] | Supervision Fee [Member] |  |
Related Party Transaction, Amounts of Transaction |  | 27
Central Shipping Monaco SAM [Member] | Superintendent Fees [Member] |  |
Related Party Transaction, Amounts of Transaction |  | 15
Central Shipping Monaco SAM [Member] | Superintendent Fees [Member] | Vessel Operating Expenses [Member] |  |
Related Party Transaction, Amounts of Transaction |  | 43
Central Shipping Monaco SAM [Member] | Accounting and Reporting Cost [Member] | Management Fees - Related Parties [Member] |  |
Related Party Transaction, Amounts of Transaction |  | 113
Central Shipping Monaco SAM [Member] | Financing Fees [Member] |  |
Related Party Transaction, Amounts of Transaction |  | 24
Central Shipping Monaco SAM [Member] | Commission for Sale and Purchase of Vessels [Member] | Management Fees - Related Parties [Member] |  |
Related Party Transaction, Amounts of Transaction |  | 1,749
Central Shipping Monaco SAM [Member] | Commissions on Charter Hire Agreements [Member] | Voyage Expenses [Member] |  |
Related Party Transaction, Amounts of Transaction |  | 245
Central Shipping Monaco SAM [Member] | Incentive Fee for the Provision of Services [Member] | Management Fees - Related Parties [Member] |  |
Related Party Transaction, Amounts of Transaction |  | $ 1,250
Central Shipping Inc [Member] |  |
Related Party Transaction, Amounts of Transaction | 1,916 |
Central Shipping Inc [Member] | Management Fees [Member] |  |
Related Party Transaction, Amounts of Transaction | 108 |
Central Shipping Inc [Member] | Management Fees [Member] | Management Fees - Related Parties [Member] |  |
Related Party Transaction, Amounts of Transaction | 1,013 |
Central Shipping Inc [Member] | Supervision Fee [Member] |  |
Related Party Transaction, Amounts of Transaction | 44 |
Central Shipping Inc [Member] | Superintendent Fees [Member] |  |
Related Party Transaction, Amounts of Transaction | 164 |
Central Shipping Inc [Member] | Superintendent Fees [Member] | Vessel Operating Expenses [Member] |  |
Related Party Transaction, Amounts of Transaction | 97 |
Central Shipping Inc [Member] | Accounting and Reporting Cost [Member] | Management Fees - Related Parties [Member] |  |
Related Party Transaction, Amounts of Transaction | 120 |
Central Shipping Inc [Member] | Financing Fees [Member] | Deferred Charges [Member] |  |
Related Party Transaction, Amounts of Transaction |  |
Central Shipping Inc [Member] | Commission for Sale and Purchase of Vessels [Member] | Management Fees - Related Parties [Member] |  |
Related Party Transaction, Amounts of Transaction |  |
Central Shipping Inc [Member] | Commissions on Charter Hire Agreements [Member] | Voyage Expenses [Member] |  |
Related Party Transaction, Amounts of Transaction | 370 |
Central Shipping Inc [Member] | Incentive Fee for the Provision of Services [Member] | Management Fees - Related Parties [Member] |  |
Related Party Transaction, Amounts of Transaction |  |

X
- Definition Amount of transactions with related party during the financial reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39622-107864 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864 + Details
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Balance Type: | debit
Period Type: | duration

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- Details
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- Details
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- Details
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