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Note 10 - Financial Instruments (Tables)
6 Months Ended
Jun. 30, 2017
Notes Tables  
Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]
    Fair Value Measurement at Reporting Date
                 
    Total,
December 31, 2016
  (Level 1)   (Level 2)   (Level 3)
                                 
Liabilities                                
Interest rate swap contracts, long-term portion   $
240,181
     
-
    $
240,181
     
-
 
    Fair Value Measurement at Reporting Date
                 
    Total,
June 30, 2017
  (Level 1)   (Level 2)   Significant Other
Unobservable
Inputs (Level 3)
                                 
Liabilities                                
Interest rate swap contracts, current and long-term portion   $
271,532
     
-
    $
271,532
     
-
 
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]
Derivatives not designated as hedging instruments   Balance Sheet Location     December 31,
2016
      June 30,
2017
 
Interest rate contracts  
Current liabilities - Derivatives
   
-
     
88,176
 
Interest rate contracts  
Long-term liabilities - Derivatives
   
240,181
     
183,356
 
Total derivative liabilities  
 
   
240,181
     
271,532
 
Derivative Instruments, Gain (Loss) [Table Text Block]
Derivatives not designated as hedging instruments   Location of gain (loss) recognized     Six Months Ended
June 30, 2016
      Six Months Ended
June 30, 2017
 
Interest rate – Fair value  
Loss on derivatives, net
   
(181,707
)    
2,298
 
Interest rate contracts  - Realized loss  
Loss on derivatives net
   
(83,180
)    
(31,351
)
Total loss on derivatives  
 
   
(264,887
)    
(29,053
)