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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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