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Note 11 - Long-term Debt (Details Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 15, 2016 USD ($) | Jun. 30, 2016 USD ($) | Feb. 16, 2016 USD ($) | Dec. 30, 2015 USD ($) | Sep. 30, 2015 USD ($) | Sep. 14, 2015 USD ($) | Sep. 03, 2015 USD ($) | Aug. 04, 2015 USD ($) | Jul. 31, 2015 USD ($) | Jul. 07, 2015 USD ($) | Apr. 21, 2015 USD ($) | Mar. 27, 2015 USD ($) | Jan. 08, 2015 USD ($) | Jul. 04, 2014 USD ($) | Jun. 30, 2014 USD ($) | Apr. 25, 2014 USD ($) | Apr. 16, 2014 USD ($) | Mar. 31, 2014 USD ($) | Dec. 20, 2013 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | May 18, 2016 USD ($) | Mar. 07, 2016 USD ($)
Proceeds from Issuance of Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 55,800,000 |  |  |  |
Repayments of Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 80,230,351 |  |  |  |
Long-term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 400,229,914 | $ 424,660,265 |  |  |
Term Loan Financial Covenants, Cash Requirement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,174,710 |  |  |  |
Debt, Weighted Average Interest Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.03% | 2.67% | 2.28% |  |
Interest Expense, Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 14,149,326 | $ 10,175,944 | $ 8,746,786 |  |
Interest Costs Capitalized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,660,802 | $ 1,822,443 | $ 2,113,297 |  |
Long-term Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 150,500,000 |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 22,750,000 |  |  | $ 30,000,000 |  |  |  |  |  |  |
Value to Term Loan Ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 130.00% |  |  |  |
Percentage of Total Debt to Total Market Value Adjusted Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 80.00% |  |  |  |
Percentage of Dividends Paid to Free Cash Flow |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |
Quarterly Commitment Fee Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.77% |  |  |  |
Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.00% |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value to Term Loan Ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 125.00% |  |  |  |
EBITDA to Interest Expense Ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.5 |  |  |  |
Quarterly Commitment Fee Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.70% |  |  |  |
Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.70% |  |  |  |
Term Loan Entered Into on June 20, 2014 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  |  |  |  |  |  |  |  |  |  |  | $ 20,925,000 |  |  |  |  |  |  |  |  |  |  |
Term Loan Entered Into on May 17, 2006 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Debt |  |  |  |  |  |  |  |  |  |  |  | $ 13,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Term Loan Entered Into on March 7, 2016 [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 76,020,000
Term Loan Entered Into on May 18, 2016 [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 74,480,000 |
Term Loan Entered into on January 30, 2009 [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt | $ 24,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Condition Met At Delivery [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 67,200,000 |  |  |  |  |
Percentage of Fair Market Value of Vessel Subject to the Minimum Employment Condition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 70.00% |  |  |  |  |
Condition Not Being Met [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 62,400,000 |  |  |  |  |
Percentage of Fair Market Value of Vessel Subject to the Minimum Employment Condition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 65.00% |  |  |  |  |
First Tranche [Member] | Term Loan Entered Into on December 20, 2013 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  |  |  |  | $ 16,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
First Tranche [Member] | Term Loan Entered Into on March 24, 2014 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 17,150,000 |  |  |  |  |  |
First Tranche [Member] | Term Loan Entered Into on July 4, 2014 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  |  |  |  |  |  | $ 11,375,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
First Tranche [Member] | Term Loan Entered Into on July 29, 2014 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  |  |  |  |  |  |  |  | $ 25,350,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
First Tranche [Member] | Term Loan Entered Into on December 24, 2015 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  |  | $ 22,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Third Tranche [Member] | Term Loan Entered Into on December 20, 2013 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  | $ 15,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Third Tranche [Member] | Term Loan Entered Into on March 24, 2014 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  |  |  |  |  |  |  | $ 15,925,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Third Tranche [Member] | Facility Agreement Entered Into on April 16, 2014 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  |  |  |  |  |  |  |  |  | $ 15,750,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Second Tranche [Member] | Term Loan Entered Into on December 20, 2013 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  |  |  | $ 16,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Second Tranche [Member] | Term Loan Entered Into on March 24, 2014 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 17,150,000 |  |  |  |  |  |  |  |  |
Second Tranche [Member] | Facility Agreement Entered Into on April 16, 2014 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 14,250,000 |  |  |  |  |  |  |  |
Second Tranche [Member] | Term Loan Entered Into on July 4, 2014 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  |  |  |  |  | $ 11,375,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fourth Tranche [Member] | Term Loan Entered Into on December 20, 2013 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Debt |  | $ 15,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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