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Note 16 - Financial Instruments - Fair Value of Company's Investments (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Vessel profit participation liability |  | $ 1,067,500 |
Vessels held for sale, impairment loss |  |  | $ 4,595,819
Fair Value, Nonrecurring [Member] |  |  |
Vessel profit participation liability |  | 1,067,500 | 1,297,100
Fair Value, Nonrecurring [Member] | Vessels [Member] |  |  |
Vessels held for sale, fair value |  |  | 5,000,000
Vessels held for sale, impairment loss |  |  | 4,595,819
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Vessel profit participation liability |  |  |
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] | Vessels [Member] |  |  |
Vessels held for sale, fair value |  |  |
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Vessel profit participation liability |  | 1,067,500 | 1,297,100
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] | Vessels [Member] |  |  |
Vessels held for sale, fair value |  |  | 5,000,000
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Vessel profit participation liability |  |  |
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Vessels [Member] |  |  |
Vessels held for sale, fair value |  |  |

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