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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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- Definition

Fixed management fee per day per vessel for vessels under time or voyage charters.

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The amount of deferred gain associated with related party transactions.

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For an unclassified balance sheet, amount of receivables arising from transactions with related parties.

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- Definition

Carrying amount as of the balance sheet date of obligations due all related parties. For classified balance sheets, represents the current portion of such liabilities (due within one year or within the normal operating cycle if longer).

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Foreign exchange rate used to translate amounts denominated in functional currency to reporting currency.

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Amount of transactions with related party during the financial reporting period.

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Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

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Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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