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Note 19 - Business Segments (Restated) - Summarized Financial Information Concerning Reportable Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Revenues $ 166,365 $ 157,185 $ 179,364 $ 189,898 $ 166,519 $ 184,617 $ 159,861 $ 151,594 $ 692,812 [1] $ 662,591 [1] $ 594,644 [1]
Depreciation and amortization expense                 115,146 105,977 107,206
Operating income 48,400 $ 43,970 $ 53,152 $ 59,496 51,229 $ 48,223 $ 51,887 $ 50,543 205,018 201,882 164,061
Total assets 2,623,864 [2]       2,461,569 [2]       2,623,864 [2] 2,461,569 [2] 2,273,982
Expenditures for long-lived assets                 259,234 151,930 152,450
Unconsolidated Investments [Member]                      
Total assets 34,084               34,084    
Intersegment Eliminations [Member]                      
Revenues                 109,040 56,075 48,559
Electricity Segment [Member]                      
Revenues                 468,329 436,292 375,920
Depreciation and amortization expense                 111,676 102,698 103,892
Operating income                 154,475 126,828 99,345
Total assets 2,508,151 [2]       2,204,444 [2]       2,508,151 [2] 2,204,444 [2] 2,044,346
Expenditures for long-lived assets                 252,581 147,211 149,666
Electricity Segment [Member] | Unconsolidated Investments [Member]                      
Total assets                  
Electricity Segment [Member] | Intersegment Eliminations [Member]                      
Revenues                
Product Segment [Member]                      
Revenues                 224,483 226,299 218,724
Depreciation and amortization expense                 3,470 3,279 3,314
Operating income                 50,543 75,054 64,716
Total assets 115,713 [2]       $ 257,125 [2]       115,713 [2] 257,125 [2] 229,636
Expenditures for long-lived assets                 6,653 4,719 2,784
Product Segment [Member] | Unconsolidated Investments [Member]                      
Total assets $ 34,084               34,084    
Product Segment [Member] | Intersegment Eliminations [Member]                      
Revenues                 $ 109,040 $ 56,075 $ 48,559
[1] Revenues as reported in the geographic area in which they originate.
[2] Electricity segment assets include goodwill in the amount of $21.0 million and $6.7 million as of December 31, 2017 and 2016, respectively.