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Note 19 - Business Segments - 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
Net revenues | $ 166,365 |  | $ 157,185 | $ 179,364 | $ 189,898 | $ 166,519 |  | $ 184,617 | $ 159,861 | $ 151,594 | $ 692,812 |  | $ 662,591 |  | $ 594,644
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
Segment assets at period end | 2,586,662 | [1] |  |  |  | 2,461,569 | [1] |  |  |  | 2,586,662 | [1] | 2,461,569 | [1] | 2,273,982
Expenditures for long-lived assets |  |  |  |  |  |  |  |  |  |  | 259,234 |  | 151,930 |  | 152,450
Unconsolidated Investments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment assets at period end | 34,084 |  |  |  |  |  |  |  |  |  | 34,084 |  |  |  |
Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  |  |  | 109,040 |  | 56,075 |  | 48,559
Electricity [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net 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
Segment assets at period end | 2,470,949 | [1] |  |  |  | 2,204,444 | [1] |  |  |  | 2,470,949 | [1] | 2,204,444 | [1] | 2,044,346
Expenditures for long-lived assets |  |  |  |  |  |  |  |  |  |  | 252,581 |  | 147,211 |  | 149,666
Electricity [Member] | Unconsolidated Investments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment assets at period end |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electricity [Member] | Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net 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
Segment assets at period end | 115,713 | [1] |  |  |  | $ 257,125 | [1] |  |  |  | 115,713 | [1] | 257,125 | [1] | 229,636
Expenditures for long-lived assets |  |  |  |  |  |  |  |  |  |  | 6,653 |  | 4,719 |  | 2,784
Product Segment [Member] | Unconsolidated Investments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment assets at period end | $ 34,084 |  |  |  |  |  |  |  |  |  | 34,084 |  |  |  |
Product Segment [Member] | Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  |  |  | $ 109,040 |  | $ 56,075 |  | $ 48,559
[1] | Electricity segment assets include goodwill in the amount of $21.0 million and $6.7 million as of December 31, 2017 and 2016, respectively.

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