Note 11 - Puna Power Plant Lease Transactions (Tables)

12 Months Ended

Dec. 31, 2014

Leases [Abstract]

Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]

	(Dollars in thousands)
Year ending December 31:
2015	$	8,222
2016		8,374
2017		8,747
2018		8,944
2019		6,018
Thereafter		6,913
Total	$	47,218