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Note 23 - Quarterly Financial Information (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Quarterly Financial Information [Table Text Block]
   
Three Months Ended
  
   
Mar. 31, 2016
    
June 30, 2016
    
Sept. 30, 2016
    
Dec. 31, 2016
    
Mar. 31, 2017
    
June 30, 2017
    
Sept. 30, 2017
    
Dec. 31, 2017
  
                                 
(As restated)
    
(As restated)
    
(As restated)
  
   
(Dollars in thousands, except per share amounts)
  
Revenues:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Electricity
   $
107,868
     $
104,001
     $
109,795
     $
114,628
     $
115,776
     $
111,777
     $
112,273
     $
128,503
  
Product
    
43,726
      
55,860
      
74,822
      
51,891
      
74,122
      
67,587
      
44,912
      
37,862
  
Total revenues
    
151,594
      
159,861
      
184,617
      
166,519
      
189,898
      
179,364
      
157,185
      
166,365
  
Cost of revenues:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Electricity
    
63,686
      
62,243
      
66,481
      
69,163
      
66,036
      
65,439
      
65,774
      
75,017
  
Product
    
24,035
      
31,822
      
43,647
      
30,719
      
49,452
      
43,432
      
32,218
      
26,992
  
Total cost of revenues
    
87,721
      
94,065
      
110,128
      
99,882
      
115,488
      
108,871
      
97,992
      
102,009
  
Gross margin
    
63,873
      
65,796
      
74,489
      
66,637
      
74,410
      
70,493
      
59,193
      
64,356
  
Operating expenses:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Research and development expenses
    
349
      
595
      
1,086
      
732
      
602
      
1,050
      
716
      
789
  
Selling and marketing expenses
    
3,675
      
3,668
      
4,793
      
4,288
      
4,363
      
4,090
      
3,630
      
3,517
  
General and administrative expenses
    
8,749
      
8,783
      
19,093
      
10,085
      
9,949
      
12,201
      
10,877
      
9,854
  
Write-off of unsuccessful exploration activities
    
557
      
863
      
1,294
      
303
      
--
      
--
      
--
      
1,796
  
Operating income
    
50,543
      
51,887
      
48,223
      
51,229
      
59,496
      
53,152
      
43,970
      
48,400
  
Other income (expense):
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Interest income
    
320
      
245
      
266
      
140
      
244
      
362
      
255
      
127
  
Interest expense, net
    
(16,023
 )    
(18,401
 )    
(17,137
 )    
(15,828
 )    
(14,923
 )    
(14,540
 )    
(11,692
 )    
(12,987
 )
Derivatives and foreign currency transaction gains (losses)
    
1,962
      
(4,332
 )    
(222
 )    
(2,942
 )    
1,338
      
1,703
      
(1,001
 )    
614
  
Income attributable to sale of tax benefits
    
4,398
      
4,519
      
3,463
      
4,123
      
6,157
      
4,356
      
3,506
      
3,859
  
Other non-operating income (expense), net
    
191
      
49
      
(5,546
 )    
(39
 )    
(92
 )    
6
      
(1,592
 )    
12
  
Income (loss) from continuing operations, before income taxes and equity in income (losses) of investees
    
41,391
      
33,967
      
29,047
      
36,683
      
52,220
      
45,039
      
33,446
      
40,025
  
Income tax benefit (provision)
    
(9,079
 )    
(8,515
 )    
(12,109
 )    
(7,356
 )    
(11,004
 )    
(32,765
 )    
(6,224
 )    
28,329
  
Equity in income (losses) of investees
    
(937
 )    
(1,144
 )    
(2,653
 )    
(3,001
 )    
(1,599
 )    
(428
 )    
337
      
(267
 )
Net income (loss)
    
31,375
      
24,308
      
14,285
      
26,326
      
39,617
      
11,846
      
27,559
      
68,087
  
Net loss (income) attributable to noncontrolling interest
    
(1,674
 )    
(584
 )    
(2,326
 )    
(3,002
 )    
(4,423
 )    
(3,206
 )    
(3,599
 )    
(3,467
 )
Net income (loss) attributable to the Company's stockholders
   $
29,701
     $
23,724
     $
11,959
     $
23,324
     $
35,194
     $
8,640
     $
23,960
     $
64,620
  
                                                                 
Earnings (loss) per share attributable to the Company's stockholders
                                                                
                                                                 
Basic:
                                                                
Net income
   $
0.60
     $
0.48
     $
0.24
     $
0.47
     $
0.71
     $
0.17
     $
0.48
     $
1.28
  
                                                                 
Diluted:
                                                                
Net income
   $
0.60
     $
0.47
     $
0.24
     $
0.46
     $
0.70
     $
0.17
     $
0.47
     $
1.27
  
                                                                 
Weighted average number of shares used in computation of earnings per share attributable to the Company's stockholders:
                                                                
Basic
    
49,173
      
49,456
      
49,599
      
49,647
      
49,680
      
49,771
      
50,367
      
50,607
  
Diluted
    
49,782
      
50,137
      
50,289
      
50,293
      
50,491
      
50,624
      
50,867
      
51,053