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Note 14 - Derivative Financial Instruments - Gain or Loss on Derivatives Not Designated as Hedging Instruments (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Total net gain / (loss) on derivatives | $ (2,885) | $ (44,343) | $ 12,389
Not Designated as Hedging Instrument [Member] | Interest Rate Contracts, Unrealized (Loss) / Gain [Member] |  |  |
Total net gain / (loss) on derivatives |  | 204,647 | (5,901)
Not Designated as Hedging Instrument [Member] | Freight Forward Agreements, Unrealized Gain (Loss) [Member] |  |  |
Total net gain / (loss) on derivatives |  |  | (781)
Not Designated as Hedging Instrument [Member] | Interest Rate Contracts, Realized (Loss) / Gain [Member] |  |  |
Total net gain / (loss) on derivatives | (2,885) | (201,745) | 19,071
Not Designated as Hedging Instrument [Member] | Freight Forward Agreements, Realized Gain (Loss) [Member] |  |  |
Total net gain / (loss) on derivatives |  | (47,245) |
Not Designated as Hedging Instrument [Member] | Interest Rate Swap Contracts, Fair Value [Member] |  |  |
Total net gain / (loss) on derivatives | (2,885) | 2,902 | 13,170
Not Designated as Hedging Instrument [Member] | Freight Forward Agreements [Member] |  |  |
Total net gain / (loss) on derivatives |  | $ (47,245) | $ (781)

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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4CC -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL109998890-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624171-113959 + Details
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