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Note 13 - Puna Power Plant Lease Transactions (Tables)
12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
   
(Dollars in
thousands)
 
Year ending December 31:
 
 
 
 
2017
  $
8,747
 
2018
   
8,944
 
2019
   
6,018
 
2020
   
2,450
 
2021
   
1,723
 
Thereafter
   
2,740
 
Total
  $
30,622