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Note 9 - Equity Method Investment (Tables)
6 Months Ended
Jun. 30, 2019
Balance Sheet [Member]  
Notes Tables  
Equity Method Investments [Table Text Block]
(in thousands)
 
As of June 30,
   
As of December 31,
 
   
2019
   
2018
 
Current Assets
  $
26,400
    $
25,877
 
Non-current Assets
   
320,129
     
273,987
 
Current Liabilities
   
15,802
     
78,530
 
Non-current Liabilities
   
275,901
     
176,389
 
Total Equity
  $
54,826
    $
44,945
 
Income Statement [Member]  
Notes Tables  
Equity Method Investments [Table Text Block]
   
Three Months Ended
   
Six Months Ended
 
   
June 30,
   
June 30,
 
   
2019
   
2018
   
2019
   
2018
 
Revenue
  $
24,505
    $
23,574
    $
51,988
    $
48,715
 
Operating Expenses
   
17,052
     
18,374
     
37,052
     
38,999
 
Operating Income
   
7,453
     
5,200
     
14,936
     
9,716
 
Net Income
  $
4,792
    $
3,464
    $
9,881
    $
6,482