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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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- Definition

Represents the EBITDA to interest expense ratio during the period.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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