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Note 13 - Capital Stock Share Repurchase Program (Details) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended	6 Months Ended	9 Months Ended
	Jul. 31, 2019 $ / shares shares	Jun. 30, 2019 USD ($) $ / shares shares	Jun. 30, 2019 USD ($) $ / shares shares	Sep. 30, 2019 shares	Mar. 20, 2019 USD ($)	Aug. 16, 2018 USD ($)
Third Quarter 2018 Repurchase Program
Capital Stock [Line Items]
Stock Repurchase Program, Authorized Amount						$ 100.0
First Quarter 2019 Repurchase Program
Capital Stock [Line Items]
Stock Repurchase Program, Authorized Amount					$ 150.0
Total of All Repurchase Programs
Capital Stock [Line Items]
Stock Repurchase Program, Authorized Amount					$ 250.0
Stock Repurchased During Period, Shares | shares		7,470,332	9,017,006
Accelerated Share Repurchases, Final Price Paid Per Share | $ / shares		$ 22.20	$ 21.92
Stock Repurchase Program, Remaining Authorized Repurchase Amount		$ 52.5	$ 52.5
Subsequent Event | Total of All Repurchase Programs
Capital Stock [Line Items]
Stock Repurchased During Period, Shares | shares	2,241,568			11,258,574
Accelerated Share Repurchases, Final Price Paid Per Share | $ / shares	$ 23.43
Percent of Reduction in Shares Outstanding	0.053

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Percent of Reduction in Shares Outstanding

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Final price paid per share for the purchase of the targeted number of shares, determined by an average market price over a fixed period of time.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 25
-Paragraph 5
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Amount of stock repurchase plan authorized.

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Amount remaining of a stock repurchase plan authorized.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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-Section S99
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