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Note 4 - Long-Term And Fair Value Disclosure (Details) (USD $)
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1 Months Ended | ||||
|---|---|---|---|---|---|
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Jun. 17, 2013
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Jan. 31, 2014
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Apr. 30, 2013
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Dec. 17, 2013
Subsequent Event [Member]
Series B 3.75% Notes [Member]
|
Dec. 17, 2013
Subsequent Event [Member]
Senior Notes [Member]
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| Note 4 - Long-Term And Fair Value Disclosure (Details) [Line Items] | |||||
| Long-term Debt, Fair Value | $ 849,000,000 | $ 721,000,000 | |||
| Line of Credit Facility, Maximum Borrowing Capacity | 100,000,000 | ||||
| Line of Credit Facility, Amount Outstanding | 0 | 59,100,000 | |||
| Debt, Weighted Average Interest Rate | 0.95% | ||||
| Senior Notes | 50,000,000 | ||||
| Debt Instrument, Interest Rate, Stated Percentage | 3.75% | ||||
| Line of Credit Facility, Decrease, Forgiveness | $ 25,000,000 | ||||