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Note 9 - Equity Method Investment (Tables)
9 Months Ended
Sep. 30, 2018
Balance Sheet [Member]  
Notes Tables  
Equity Method Investments [Table Text Block]
(in thousands)
 
As of September 30,
2018
   
As of December 31,
2017
 
Current Assets
  $
23,276
    $
19,660
 
Non-current Assets
   
255,352
     
183,905
 
Current Liabilities
   
15,451
     
53,981
 
Non-current Liabilities
   
219,878
     
117,135
 
Total Equity
  $
43,299
    $
32,449
 
Income Statement [Member]  
Notes Tables  
Equity Method Investments [Table Text Block]
   
For the three
months
ended
September 30,
2018
   
For the three
months
ended
September 30,
2017
   
For the nine
months
ended
September 30,
2018
   
For the nine
months
ended
September 30,
2017
 
Revenue
  $
25,437
    $
18,299
    $
74,152
    $
64,543
 
Operating Expenses
   
19,061
     
15,439
     
58,060
     
55,753
 
Operating Income
   
6,376
     
2,860
     
16,092
     
8,790
 
Net Income
  $
4,369
    $
1,499
    $
10,850
    $
5,188