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Note 7 - Income Taxes (Details Textual) - USD ($)	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Income Tax Expense (Benefit), Total	$ (20,860,000)	$ 1,717,000	$ (15,580,000)	$ (6,600,000)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest, Total			57,696,000	$ 23,115,000
Income Tax Reconciliation, Tax Credit, CARES Act			187,000
Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Amount			$ 15,425,000
Effective Income Tax Rate Reconciliation, Percent, Total			27.00%	29.00%
Domestic Tax Authority [Member]
Open Tax Year	2016 2017 2018 2019
State and Local Jurisdiction [Member]
Open Tax Year	2015 2016 2017 2018 2019

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Amount of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations, attributable to Coronavirus Aid, Relief and Economic Security ("CARES") Act.

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