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Note 20 - Subsequent Events (Details)						3 Months Ended	12 Months Ended
	Feb. 24, 2016 USD ($)	Feb. 24, 2016 EUR (€)	Feb. 16, 2016 USD ($)	Feb. 05, 2016 USD ($)	May. 26, 2014 EUR (€)	Mar. 31, 2016 $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2014 $ / shares shares	Dec. 31, 2013 shares	Dec. 31, 2012 shares	Dec. 31, 2011 $ / shares shares	Dec. 31, 2010 $ / shares shares	Mar. 09, 2016 USD ($)	Mar. 07, 2016 USD ($)
Note 20 - Subsequent Events (Details) [Line Items]
Proceeds from Issuance of Debt							$ 155,100,000
Stock Repurchased During Period, Shares (in Shares) | shares							2,372,097	843,022	0	0	551,646	1,205,229
Treasury Stock Acquired, Average Cost Per Share (in Dollars per share) | $ / shares							$ 5.46	$ 6.30			$ 4.05	$ 5.21
Subsequent Event [Member]
Note 20 - Subsequent Events (Details) [Line Items]
Stock Repurchased During Period, Shares (in Shares) | shares						644,178
Treasury Stock Acquired, Average Cost Per Share (in Dollars per share) | $ / shares						$ 3.09
March 7, 2016 Term Loan [Member] | Subsequent Event [Member]
Note 20 - Subsequent Events (Details) [Line Items]
Loans Payable to Bank														$ 76,020,000
March 9, 2016 Term Loan [Member] | Subsequent Event [Member]
Note 20 - Subsequent Events (Details) [Line Items]
Loans Payable to Bank													$ 74,480,000
Third Tranche [Member] | Term Loan Entered Into on December 20, 2013 [Member] | Subsequent Event [Member]
Note 20 - Subsequent Events (Details) [Line Items]
Proceeds from Issuance of Debt			$ 15,600,000
Brave [Member]
Note 20 - Subsequent Events (Details) [Line Items]
Related Party Transaction, Vessel Construction Fee, Per Vessel | €					€ 390,000
Brave [Member] | Subsequent Event [Member]
Note 20 - Subsequent Events (Details) [Line Items]
Related Party Transaction, Vessel Construction Fee, Per Vessel	$ 539,343	€ 490,000
Eco Nical Vessel [Member] | Subsequent Event [Member]
Note 20 - Subsequent Events (Details) [Line Items]
Payment Installment for Vessel Delivery				$ 12,472,151

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Including the current and noncurrent portions, carrying value as of the balance sheet date of loans from a bank with maturities initially due after one year or beyond the normal operating cycle if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.16)
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-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 19, 20, 22
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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Total cost of shares repurchased divided by the total number of shares repurchased.

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