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Note 8 - Property, Plant and Equipment and Construction-in-process (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
December 31
,
  
   
2017
    
2016
  
   
(Dollars in thousands
)
  
Land owned by the Company where the geothermal resource is located
   $
32,178
     $
31,904
  
Leasehold improvements
    
3,984
      
3,848
  
Machinery and equipment
    
182,121
      
152,821
  
Land, buildings and office equipment
    
31,128
      
28,634
  
Automobiles
    
12,596
      
11,161
  
Geothermal and recovered energy generation power plants, including geothermal wells and exploration and resource development costs:
               
United States of America, net of cash grants and impairment charges
    
1,744,728
      
1,658,195
  
Foreign countries
    
700,498
      
541,626
  
Asset retirement cost
    
10,563
      
8,669
  
     
2,717,797
      
2,436,858
  
Less accumulated depreciation
    
(983,106
 )    
(880,480
 )
                 
Property, plant and equipment, net
   $
1,734,691
     $
1,556,378
  
Construction In Progress [Table Text Block]
   
December 31,
  
   
2017
   
2016
 
   
(Dollars in thousands)
  
Projects under exploration and development:
                
Up-front bonus lease costs
   $
17,018
     $
17,385
  
Exploration and development costs
    
46,154
      
36,359
  
Interest capitalized
    
703
      
703
  
     
63,875
      
54,447
  
Projects under construction:
                
Up-front bonus lease costs
    
27,473
      
37,713
  
Drilling and construction costs
    
198,943
      
202,211
  
Interest capitalized
    
3,251
      
12,338
  
     
229,667
      
252,262
  
Total
   $
293,542
     $
306,709
  
Rollforward Of Construction In Process [Table Text Block]
   
Projects under Exploration and Development
  
   
Up-front
Bonus Lease
Costs
    
Exploration
and
Development
Costs
    
Interest Capitalized
    
Total
  
   
(Dollars in thousands)
  
Balance at December 31, 2014
   $
26,618
     $
45,977
     $
836
     $
73,431
  
Cost incurred during the year
    
37
      
10,104
      
869
      
11,010
  
Write off of unsuccessful exploration costs
    
(164
 )    
(1,415
 )    
—
      
(1,579
 )
Transfer of projects under exploration and development to projects under construction
    
—
      
(18,940
 )    
(1,002
 )    
(19,942
 )
Balance at December 31, 2015
    
26,491
      
35,726
      
703
      
62,920
  
Cost incurred during the year
    
1,514
      
25,165
      
—
      
26,679
  
Write off of unsuccessful exploration costs
    
(380
 )    
(2,637
 )    
—
      
(3,017
 )
Transfer of projects under exploration and development to projects under construction
    
(10,240
 )    
(21,895
 )    
—
      
(32,135
 )
Balance at December 31, 2016
    
17,385
      
36,359
      
703
      
54,447
  
Cost incurred during the year
    
—
      
11,224
      
—
      
11,224
  
Write off of unsuccessful exploration costs
    
(367
 )    
(1,429
 )    
—
      
(1,796
 )
Balance at December 31, 2017
   $
17,018
     $
46,154
     $
703
     $
63,875
  
   
Projects under Construction
  
   
Up-front
Bonus Lease
Costs
    
Drilling and Construction Costs
    
Interest Capitalized
    
Total
  
   
(Dollars in thousands)
  
Balance at December 31, 2014
   $
27,473
     $
187,545
     $
8,273
     $
223,291
  
Cost incurred during the year
    
—
      
140,977
      
3,556
      
144,533
  
Transfer of projects under exploration and development to projects under construction
    
—
      
18,940
      
1,002
      
19,942
  
Transfer of completed projects to property, plant and equipment
    
—
      
(196,995
 )    
(4,856
 )    
(201,851
 )
                                 
Balance at December 31, 2015
    
27,473
      
150,467
      
7,975
      
185,915
  
Cost incurred during the year
    
—
      
116,247
      
6,510
      
122,757
  
Transfer of exploration and development projects to projects under construction
    
10,240
      
21,895
      
—
      
32,135
  
Transfer of completed projects to property, plant and equipment
    
—
      
(86,398
 )    
(2,147
 )    
(88,545
 )
Balance at December 31, 2016
    
37,713
      
202,211
      
12,338
      
252,262
  
Cost incurred during the year
    
—
      
231,926
      
7,300
      
239,226
  
Transfer of completed projects to property, plant and equipment
    
(10,240
 )    
(235,194
 )    
(16,387
 )    
(261,821
 )
                                 
Balance at December 31, 2017
   $
27,473
     $
198,943
     $
3,251
     $
229,667