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Note 5 - Transactions With Related Parties (Details Textual) - USD ($) |  |  |  | 6 Months Ended
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Mar. 29, 2019 | Jan. 02, 2018 | Sep. 01, 2017 | Jun. 30, 2019 | Jun. 30, 2018
Chief Executive Officer [Member] | Incentive Compensation for Completion of Newbuilding Program [Member] |  |  |  |  |
Related Party Transaction, Amounts of Transaction |  | $ 2,250,000 |  |  |
Central Shipping Monaco SAM [Member] |  |  |  |  |
Related Party Transaction, Amounts of Transaction |  |  |  |  | $ 4,625,000
Central Shipping Monaco SAM [Member] | Newbuilding Supervision Fee [Member] |  |  |  |  |
Related Party Transaction, Amounts of Transaction |  |  |  | $ 463,000 | $ 386,000
Immediate Family Member of Management or Principal Owner [Member] | Family Trading [Member] | Revolving Credit Facility [Member] |  |  |  |  |
Stock Issued During Period, Shares, New Issues | 27,129 |  |  |  |
Central Ship Chartering [Member] |  |  |  |  |
Charter Term |  |  | 3 years |  |
Charter Rate Per Day |  |  | $ 14,750 |  |
Charter Option Term |  |  | 2 years |  |
Related Party Chartering Commission Percentage |  |  | 1.25% |  |
Percentage of Profit Share Per Day Over Fixed Amount |  |  | 50.00% |  |
Central Ship Chartering [Member] | Optional Year 1 [Member] |  |  |  |  |
Charter Rate Per Day |  |  | $ 15,250 |  |
Central Ship Chartering [Member] | Optional Year 2 [Member] |  |  |  |  |
Charter Rate Per Day |  |  | $ 15,750 |  |

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- 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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