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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.

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