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Note 12 - Puna Power Plant Lease Transactions (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
Year ending December 31:
 
(Dollars in
thousands)
 
2019
  $
7,771
 
2020
   
4,197
 
2021
   
3,475
 
2022
   
2,474
 
2023
   
1,603
 
Later years
   
9,292
 
Total minimum
rental
payments
 
$
28,812
 
Projected [Member]  
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
   
(Dollars in
thousands)
 
Year ending December 31:
 
 
 
 
2019
  $
6,018
 
2020
   
2,450
 
2021
   
1,723
 
2022
   
824
 
2023
   
-
 
Thereafter
   
1,917
 
Total
  $
12,932