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Note 17 - Quarterly Results of Operations (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
 [1]
Mar. 31, 2015
 [2]
Dec. 31, 2014
Sep. 30, 2014
 [3]
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Revenues $ 208,061 $ 173,512 $ 175,451 $ 167,216 $ 206,788 $ 177,581 $ 173,654 $ 160,957 $ 724,240 $ 718,980 $ 684,549
Operating income (loss) 24,336 14,629 18,774 10,043 24,650 5,586 9,056 354 67,782 39,646 20,394
Net income $ 13,230 $ 7,627 $ 11,001 $ 10,227 $ 13,545 $ 1,857 $ 3,780 $ (1,374) $ 42,085 $ 17,808 $ 5,244
Basic income per share (in dollars per share) $ 0.74 $ 0.42 $ 0.60 $ 0.56 $ 0.84 [4] $ 0.12 [4] $ 0.25 [4] $ (0.09) [4] $ 2.32 $ 1.17 $ 0.35
Diluted income per share (in dollars per share) $ 0.72 $ 0.42 $ 0.60 $ 0.56 $ 0.82 [4] $ 0.12 [4] $ 0.25 [4] $ (0.09) [4] $ 2.30 $ 1.15 $ 0.35
[1] includes $3.6 million in return of previously expensed insurance premiums for the commutation of our primary auto liability policy for the period of April 1, 2013, through September 30, 2014.
[2] Includes $4.7 million after tax one-time federal income tax credit.
[3] Includes $7.5 million increase to claims reserves for a 2008 cargo claim.
[4] Quarter totals do not aggregate to annual results to the dilution related to the follow-on stock offering.