Annual report pursuant to Section 13 and 15(d)

Note 10 - Fair Value Measurements - Assets and Liabilities on Recurring Basis (Details)

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Note 10 - Fair Value Measurements - Assets and Liabilities on Recurring Basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Derivative Liability $ 6,935 $ 6,898
Derivative instruments (included in other receivables) 419
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]    
Construction reserve funds 28,221 45,361
Derivative Liability
Exchange Option Liability on Subsidiary Convertible Senior Notes
Derivative instruments (included in other receivables)  
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]    
Construction reserve funds
Derivative Liability 1,659 66
Exchange Option Liability on Subsidiary Convertible Senior Notes
Derivative instruments (included in other receivables)   419
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]    
Construction reserve funds [1]
Derivative Liability [1]
Exchange Option Liability on Subsidiary Convertible Senior Notes [1] $ 5,276 6,832
Derivative instruments (included in other receivables) [1]  
[1] For the year ended December 31, 2018, the Company recognized a $1.6 million gain in the fair market valuation of the Convertible Senior Notes, as valued by an independent third-party.