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Note 3 - Transactions with Related Parties (Details Textual) |  |  | 12 Months Ended
--- | --- | --- | ---
Jan. 25, 2016 USD ($) | Jan. 25, 2016 EUR (€) | May 26, 2014 EUR (€) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Due to Related Parties, Current |  |  |  | $ 7,890,933 | $ 9,188,852 |
Revenue from Related Parties |  |  |  | 7,592,784 | $ 9,814,000 | $ 9,814,000
The Manager [Member] |  |  |  |  |  |
Management Fee, Per Day, Per Vessel |  |  |  | 440 |  |
Management Fee, Per Day, Per Vessel, Under Bareboat Charter |  |  |  | $ 125 |  |
Vessel Brokerage Commission Percentage |  |  |  | 1.25% | 1.25% | 1.25%
Sales and Purchase Broker Commission Fee, Percentage |  |  |  | 1.00% |  |
Due to Related Parties, Current |  |  |  | $ 7,890,933 | $ 9,188,852 |
The Manager [Member] | Brokerage Commission Fees [Member] | Voyage Expenses - Related Party [Member] |  |  |  |  |  |
Related Party Transaction, Expenses from Transactions with Related Party |  |  |  | 1,772,240 | 1,725,683 | $ 1,613,421
The Manager [Member] | Management Fees [Member] | Management Fees - Related Party [Member] |  |  |  |  |  |
Related Party Transaction, Expenses from Transactions with Related Party |  |  |  | 7,346,180 | 6,452,145 | 5,501,675
The Manager [Member] | Additional Charge Per Day When Visits Exceed Five Days in Twelve Month Period [Member] |  |  |  |  |  |
Related Party Transaction, Expenses from Transactions with Related Party |  |  |  | 500 |  |
The Manager [Member] | Superintendent Fees [Member] | Vessels' Operating Expenses - Related Party [Member] |  |  |  |  |  |
Related Party Transaction, Expenses from Transactions with Related Party |  |  |  | 172,000 | 245,000 | 167,000
The Manager [Member] | Commission Fees Incurred and Capitalized to the Cost of Vessels [Member] |  |  |  |  |  |
Related Party Transaction, Amounts of Transaction |  |  |  | 421,639 | 1,925,563 | 984,355
The Manager [Member] | Commission Expense Related to the sale and Leaseback of Vessels [Member] | Deferred Gain on Sale and Leaseback of Vessels [Member] |  |  |  |  |  |
Related Party Transaction, Deferred Gain |  |  |  |  |  | 285,000
The Manager [Member] | Commission Expense Related to the sale and Leaseback of Vessels [Member] | Net Gain on Sale of Vessels [Member] |  |  |  |  |  |
Related Party Transaction, Expenses from Transactions with Related Party |  |  |  | 13,711 | 21,177 |
The Manager [Member] | Reimbursed Compensation [Member] | General and Administrative Expense [Member] |  |  |  |  |  |
Related Party Transaction, Expenses from Transactions with Related Party |  |  |  | 1,114,130 | 1,077,698 | 1,317,237
The Manager [Member] | Amounts Paid in Connection to Charter Agreements for the Vessels' Operating Expense [Member] | Vessels' Operating Expenses - Related Party [Member] |  |  |  |  |  |
Related Party Transaction, Expenses from Transactions with Related Party |  |  |  | 2,969,843 | 3,932,042 | 3,932,352
Affiliated Company of the Manager [Member] | Office Space Rent [Member] | General and Administrative Expense [Member] |  |  |  |  |  |
Related Party Transaction, Expenses from Transactions with Related Party |  |  |  | 72,907 | 72,753 | 76,788
Emihar Petroleum Inc [Member] |  |  |  |  |  |
Revenue from Related Parties |  |  |  | 7,592,784 | 9,814,000 | 9,814,000
Accounts Receivable, Related Parties |  |  |  | 115,599 | 228,494 |
Brave [Member] | Vessel Construction Fee Per Vessel [Member] |  |  |  |  |  |
Related Party Transaction, Amounts of Transaction | $ 539,343 | € 490,000 | € 390,000 |  |  |
Foreign Currency Exchange Rate, Translation | 1.1007 | 1.1007 |  |  |  |
Brave [Member] | Capitalized Construction Supervision Fees [Member] |  |  |  |  |  |
Related Party Transaction, Amounts of Transaction |  |  |  | $ 854,022 | $ 1,726,265 | $ 984,204

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