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Note 11 - Financial Instruments (Tables)
6 Months Ended
Jun. 30, 2019
Notes Tables  
Schedule of Derivative Liabilities at Fair Value [Table Text Block]
Agreement Date   Counterparty   Effective (start) date:   Termination Date:   Notional amount
on effective date
  Interest rate payable
June 3, 2016  
ABN Amro Bank
 
April 13, 2018
 
Ju1y 13, 2021
  $
16,575
     
1.4425
%
December 19, 2016  
ABN Amro Bank
 
December 21, 2016
 
January 13, 2022
  $
20,700
     
2.0800
%
March 29, 2017  
NORD/LB Bank
 
May 17, 2017
 
May 17, 2023
  $
21,139
     
2.1900
%
March 29, 2018  
Alpha Bank
 
March 29, 2018
 
February 25, 2025
  $
21,900
     
2.9700
%
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
Warrants Outstanding
December 31, 2018
  Warrant Shares Outstanding
December 31, 2018
  Term
(in years)
  Warrant Exercise
Price*
  Fair Value – Liability
December 31, 2018
  1,976,389      
424,923
     
5
    $
11.60
     
1,915
 
Warrants Outstanding
June 30, 2019
  Warrant Shares Outstanding
June 30, 2019
  Term
(in years)
  Warrant Exercise
Price
  Fair Value – Liability
June 30, 2019
  333,500      
125,896
     
5
    $
6.60
     
281
 
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
          Fair Value Measurement at Reporting Date  
As of December 31, 2018   Total    
Using Quoted Prices in
Active Markets for
Identical Assets
(Level 1)
   
Significant
Other
Observable
Inputs
(Level 2)
   
Significant
Other
Unobservable
Inputs
(Level 3)
 
Non-current asset    
1,153
     
-
     
1,153
     
-
 
Current liability    
1,915
     
-
     
-
     
1,915
 
Non-current liability    
359
     
-
     
359
     
 
 
As of June 30, 2019                                
Non-current asset    
165
     
-
     
165
     
-
 
Current liability    
281
     
-
     
-
     
281
 
Non-current liability    
1,257
     
-
     
1,257
     
-
 
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
Closing balance – December 31, 2018    
1,915
 
Change in fair value of warrants, included in the condensed consolidated statements of comprehensive loss    
1,634
 
Closing balance – June 30, 2019    
281
 
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]
Quantitative information about Level 3 Fair Value Measurements
Derivative
type
  Fair Value at
December 31,
2018
  Fair Value at
June 30,
2019
  Balance
Sheet
Location
  Valuation
Technique
  Significant
Unobservable
Input
  Value
December 31, 2018
  Value
June 30,
2019
Warrants    
1,915
     
281
   
Current liabilities –Derivative financial instruments
 
Cox, Ross and Rubinstein Binomial
 
Volatility
   
110
%    
60
%
Derivative Instruments, Gain (Loss) [Table Text Block]
    Amount of gain recognized in
Statement of comprehensive loss
located in gain/(loss) on Derivate
Financial Instruments
 
    Six Months Ended
June 30, 2018
    Six Months Ended
June 30, 2019
 
Interest rate swaps- change in fair value    
1,324
     
-
 
Interest rate swaps– realized loss    
(81
)    
(147
)
Warrants- change in fair value    
(1,113
)    
1,634
 
Total    
130
     
1,487
 
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
    Unrealized (Loss) on cash
flow hedges
Balance, December 31, 2018    
-
 
Effective portion of changes in fair value of interest swap contracts    
(1,388
)
Balance, June 30, 2019    
(1,388
)