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Note 11 - Long-term Debt (Details Textual)
12 Months Ended
Apr. 17, 2018
USD ($)
Feb. 08, 2018
USD ($)
Jan. 10, 2018
USD ($)
Jan. 10, 2018
USD ($)
Dec. 11, 2017
USD ($)
May 16, 2017
USD ($)
Sep. 15, 2016
USD ($)
Jun. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Dec. 20, 2013
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Feb. 14, 2018
USD ($)
Dec. 07, 2017
USD ($)
Mar. 01, 2017
USD ($)
May 18, 2016
USD ($)
Proceeds from Issuance of Debt                     $ 43,000,000            
Long-term Debt, Total                     386,975,841 $ 400,229,914          
Term Loan Financial Covenants, Cash Requirement                     7,917,738            
Debt Issuance Costs, Gross                     7,871,170 7,055,914          
Amortization of Debt Issuance Costs                     $ 690,841 $ 715,587 $ 587,157        
Debt, Weighted Average Interest Rate                     3.97% 3.43% 2.67%        
Interest Expense, Debt, Total                     $ 15,640,377 $ 14,149,326 $ 10,175,944        
Interest Costs Capitalized                     813,423 $ 1,660,802 $ 1,822,443        
Long-term Line of Credit, Total                     $ 125,260,000            
Maximum [Member]                                  
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                     0.80%            
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%              
Term Loan Entered Into on December 20, 2013 [Member]                                  
Proceeds from Issuance of Debt               $ 15,600,000 $ 16,000,000                
Term Loan Entered Into on May 18, 2016 [Member]                                  
Proceeds from Issuance of Debt           $ 32,500,000                      
Term Loan Entered Into on May 18, 2016 [Member] | Subsequent Event [Member]                                  
Proceeds from Issuance of Debt     $ 33,150,000                            
Term Loan Entered Into on May 18, 2016 [Member] | Maximum [Member]                                  
Debt Instrument, Maximum Borrowing Capacity                                 $ 74,480,000
Term Loan Entered into on January 30, 2009 [Member]                                  
Proceeds from Issuance of Debt             $ 24,600,000                    
Term Loan Entered Into March 1, 2017 [Member]                                  
Debt Instrument, Maximum Borrowing Capacity                               $ 76,020,000  
Term Loan Entered Into March 1, 2017 [Member] | Subsequent Event [Member]                                  
Proceeds from Issuance of Debt $ 35,262,500     $ 35,525,000                          
Term Loan Entered December 7, 2017 [Member]                                  
Proceeds from Issuance of Debt         $ 10,500,000                        
Debt Instrument, Maximum Borrowing Capacity                             $ 22,500,000    
Term Loan Entered December 7, 2017 [Member] | Subsequent Event [Member]                                  
Proceeds from Issuance of Debt   $ 11,775,000                              
Term Loan Refinanced on a Long Term Basis [Member] | Subsequent Event [Member]                                  
Long-term Debt, Total                           $ 27,675,000