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Note 11 - Financial Instruments (Tables)
6 Months Ended
Jun. 30, 2017
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%
December 19, 2016
ABN Amro Bank
December 21, 2016
August 10, 2022
$19,450
2.1250%
March 29, 2017
NORD/LB Bank
May 17, 2017
May 17, 2023
$21,139
2.1900%
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
Warrants Outstanding
December 31, 2016
  Warrant Shares Outstanding
December 31, 2016
  Term (years)   Warrant Exercise Price*   Fair Value – Liability
December 31, 2016
2,673,406    
3,381,791
   
5
   
$1.97
   
3,222
 
Warrants Outstanding
June 30, 2017
  Warrant Shares Outstanding
June 30, 2017
  Term   Warrant Exercise Price   Fair Value – Liability
June 30, 2017
2,399,141    
17,081,886
   
5
   
$0.35
   
1,397
 
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
           
Fair Value Measurement at Reporting Date
 
 
As of December 31, 2016
   
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
   
300
   
-
   
300
   
-
 
Non-current liability
   
3,563
   
-
   
341
   
3,222
 
As of June 30, 2017
                         
Non-current asset
   
202
   
-
   
202
   
-
 
Non-current liability
   
2,028
   
-
   
631
   
1,397
 
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
Closing balance – December 31, 2016  
3,222
 
Change in fair value of warrants, included in the consolidated statements of comprehensive income/(loss)  
(1,679
)
Adjustment for cashless exercise of warrants, included in Additional paid-in capital line item of consolidated balance sheets  
(146
)
Closing balance – June 30, 2017  
1,397
 
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,
2016
Fair Value at
June 30,
2017
Balance Sheet Location
Valuation
Technique
Significant
Unobservable Input
Value
December 31, 2016
Value
June 30, 2017
Warrants
3,222
1,397
Non-Current liabilities –Derivative financial instruments
Cox, Ross and Rubinstein Binomial
Volatility
104.70%
169.16%
Derivative Instruments, Gain (Loss) [Table Text Block]
    Amount of gain/(loss) recognized in Statement of comprehensive income/(loss) located in gain on Derivate Financial Instruments
    June 30, 2016   June 30, 2017
Interest rate swaps- change in fair value  
(156
)  
(388
)
Interest rate swaps– realized loss  
-
   
(234
)
Warrants- change in fair value  
1,376
   
1,679
 
Total  
1,220
   
1,057