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Note 11 - Income Taxes - Provision for Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Oct. 31, 2017
Jul. 31, 2017
Apr. 30, 2017
Jan. 31, 2017
Oct. 31, 2016
Jul. 31, 2016
Apr. 30, 2016
Jan. 31, 2016
Oct. 31, 2017
Oct. 31, 2016
Oct. 31, 2015
Federal (1) [1]                 $ (2,796) $ (1,497)
State (2) [2]                 1,371 1,200 523
Total current income tax expense (benefit):                 1,371 (1,596) (974)
Federal                 275,688 5,594 (8,461)
State                 9,890 1,257 3,770
Total deferred income tax expense (benefit):                 285,578 6,851 (4,691)
Total $ 464 $ 287,036 $ (1,017) $ 466 $ 9,852 $ 1,567 $ (9,143) $ 2,979 $ 286,949 $ 5,255 $ (5,665)
[1] The current federal income tax did not include the use of federal net operating losses for the year ended October 31, 2017. The current federal income tax benefit is net of the use of federal net operating losses totaling $4.4 million and $3.7 million for the years ended October 31, 2016 and 2015, respectively.
[2] The current state income tax expense (benefit) is net of the use of state net operating losses totaling $18.2 million, $16.4 million and $12.3 million for the years ended October 31, 2017, 2016 and 2015, respectively.