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v3.20.1

Note 20 - Quarterly Results of Operations (Unaudited) - Quarterly Financial Information (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Operating revenues | $ 123,497 | $ 128,994 | $ 133,000 | $ 128,686 | $ 138,176 | $ 140,325 | $ 135,302 | $ 119,458 | $ 514,177 | $ 533,261 | $ 437,838
Operating expenses and costs | 141,381 | 121,461 | 119,789 | 118,999 | 123,500 | 127,172 | 125,285 | 115,702 | 501,630 | 491,659 | 425,158
Operating income (loss) | (17,884) | 7,533 | 13,211 | 9,687 | 14,676 | 13,153 | 10,017 | 3,756 | 12,547 | 41,602 | 12,680
Non-operating income (loss) | 2,457 | 490 | (197) | 3,472 | (4,704) | 935 | 632 | (879) | 6,222 | (4,016) | 5,853
Interest expense | (2,377) | (2,178) | (2,059) | (2,040) | (2,019) | (1,711) | (1,355) | (1,160) | (8,654) | (6,245) | (3,902)
Income tax (expense) benefit | 4,168 | (1,264) | (2,301) | (2,818) | (1,883) | (3,129) | (2,005) | (330) | (2,215) | (7,347) | 24,268
Net income | $ (13,636) | $ 4,581 | $ 8,654 | $ 8,301 | $ 6,070 | $ 9,248 | $ 7,289 | $ 1,387 | $ 7,900 | $ 23,994 | $ 38,899
Basic (in dollars per share) | $ (2.37) | $ 0.80 | $ 1.47 | $ 1.40 | $ 1.02 | $ 1.53 | $ 1.18 | $ 0.22 | $ 1.35 | $ 3.94 | $ 6.14
Diluted (in dollars per share) | $ (2.37) | $ 0.79 | $ 1.45 | $ 1.39 | $ 1.01 | $ 1.52 | $ 1.17 | $ 0.22 | $ 1.34 | $ 3.90 | $ 6.08
Basic (in shares) | 5,751 | 5,756 | 5,901 | 5,921 | 5,975 | 6,034 | 6,159 | 6,168 | 5,832 | 6,083 | 6,331
Diluted (in shares) | 5,751 | 5,799 | 5,949 | 5,985 | 6,029 | 6,088 | 6,229 | 6,264 | 5,880 | 6,159 | 6,398

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