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Note 10 - Financial Instruments (Tables)
3 Months Ended
Mar. 31, 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,
March 31, 2017
    (Level 1)     (Level 2)     (Level 3)  
Liabilities
                       
Interest rate swap contracts, long-term portion   $
235,109
     
-
    $
235,109
     
-
 
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
March 31, 2017
Interest rate contracts
Long-term liabilities - Derivatives
240,181
235,109
Total derivative liabilities
 
240,181
235,109
Derivative Instruments, Gain (Loss) [Table Text Block]
Derivatives not designated as hedging instruments
Location of gain (loss) recognized
Three Months Ended March 31, 2016
Three Months Ended March 31, 2017
Interest rate – Fair value
(Loss) / gain on derivatives, net
(129,661)
5,072
Interest rate contracts  - Realized loss
(Loss) /gain on derivatives, net
(69,983)
(331)
Total (loss) / gain on derivatives
 
(199,644)
4,741