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Note 10 - Financial Instruments (Tables)
6 Months Ended
Jun. 30, 2019
Notes Tables  
Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]
    Fair Value Measurement at Reporting Date
      Total,
December 31, 2018
      (Level 1)       (Level 2)       (Level 3)  
Liabilities
               
Interest rate swap contract, current portion   $
41,435
     
-
    $
41,435
     
-
 
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, 2018
 
 
 
 
June 30, 2019
 
Interest rate swap contract  
Current liabilities - Derivative
   
41,435
     
-
 
Total derivative liabilities  
 
   
41,435
     
-
 
Derivative Instruments, Gain (Loss) [Table Text Block]
Derivatives not designated as hedging instruments  
 
Location of gain (loss) recognized
    Six Months Ended June 30, 2018       Six Months Ended June 30, 2019  
Interest rate – Unrealized gain  
(Gain) / loss on derivative, net
   
142,216
     
41,435
 
Interest rate swap contract  - Realized loss  
(Gain) / loss on derivative, net
   
(137,062
)    
(44,320
)
Total gain / (loss) on derivative  
 
   
5,154
     
(2,885
)