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Note 10 - Financial Instruments (Tables)
6 Months Ended
Jun. 30, 2018
Notes Tables  
Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]
    Fair Value Measurement at Reporting Date
    Total,
December 31, 2017
  (Level 1)   (Level 2)   (Level 3)
Liabilities
               
Interest rate swap contracts, current and long-term portion   $
246,082
     
-
    $
246,082
     
-
 
    Fair Value Measurement at Reporting Date
    Total,
June 30, 2018
  (Level 1)   (Level 2)   Significant Other Unobservable Inputs (Level 3)
Liabilities
               
Interest rate swap contracts, current and long-term portion   $
103,866
     
-
    $
103,866
     
-
 
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, 2017
June 30, 2018
Interest rate contracts
Current liabilities - Derivative
229,451
60,210
Interest rate contracts
Long-term liabilities - Derivative
16,631
43,656
Total derivative liabilities
 
246,082
103,866
Derivative Instruments, Gain (Loss) [Table Text Block]
Derivatives not designated as hedging instruments
Location of gain (loss) recognized
Six Months
Ended June 30, 2017
Six Months
Ended June 30, 2018
Interest rate – Fair value
(Loss) / gain on derivative, net
(31,351)
142,216
Interest rate contracts  - Realized gain
(Loss) / gain on derivative, net
2,298
(137,062)
Total (loss) / gain on derivative
 
(29,053)
5,154