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Note 11 - Voyage and Vessel Operating Expenses - Summary of Voyage Expenses in the Consolidated Statements of Operations (Details) (Parentheticals) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Commissions on Charter Hire Agreements [Member] |  |  |
Commissions, related party | $ 761 | $ 829 | $ 511
Repairs and Maintenance [Member] |  |  |
Commissions, related party | 60 | 247 | 187
Voyage Expenses [Member] | Commissions on Charter Hire Agreements [Member] |  |  |
Commissions, related party | 761 | 829 | 511
Vessel Operating Expenses [Member] | Repairs and Maintenance [Member] |  |  |
Commissions, related party | $ 60 | $ 247 | $ 187

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- Definition Amount of transactions with related party during the financial reporting period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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 3 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864 + Details
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