Note 3 - Stock Based Compensation (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended	3 Months Ended	6 Months Ended	9 Months Ended	0 Months Ended					9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2014 2014 and 2003 Stock Option Plan [Member]	Sep. 30, 2014 2014 and 2003 Stock Option Plan [Member]	Sep. 30, 2013 2003 Stock Option Plan [Member]	Jun. 30, 2013 2003 Stock Option Plan [Member]	Sep. 30, 2013 2003 Stock Option Plan [Member]	Sep. 05, 2014 Restricted Stock [Member] Director [Member]	May 02, 2013 Restricted Stock [Member] Director [Member]	May 04, 2013 Restricted Stock [Member] Director [Member]	May 02, 2013 Restricted Stock [Member] Management [Member]	Sep. 05, 2014 Restricted Stock [Member] Senior Management [Member]	Sep. 30, 2014 Restricted Stock [Member]	May 02, 2014 2014 Plan [Member]
Note 3 - Stock Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized														7,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period			3,242,000	3,481,000	145,000		415,000
Proceeds from Stock Options Exercised (in Dollars)	$ 1.2	$ 1.9	$ 4.8	$ 6.0
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense (in Dollars)			$ 108.8	$ 113.8	$ 1.4	$ 4.5
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period								8,034	71,582	31,899		257,416	337,000
Deferred Compensation Arrangement With Individual Common Stock Vested Immediately Upon Issuance										15,946
Deferred Compensation Arrangement with Individual, Common Stock Reserved for Future Issuance										15,953
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage								25.00%			25.00%	25.00%
Share-based Compensation Arrangement by Share-based Award, Number of Modified Options											2,300,000