Note 7 - Equity-based Compensation (Details) - Summary of Stock Option Activity (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at January 1, 2013	1,216,809	1,107,712	1,198,516
Outstanding at January 1, 2013 (in Dollars per share)	$ 18.46	$ 18.98	$ 18.42
Granted	29,025	281,696	225,505
Granted (in Dollars per share)	$ 25.11	$ 18.11	$ 26.92
Exercised	(29,511)	(52,676)	(128,052)
Exercised (in Dollars per share)	$ 20.14	$ 16.66	$ 16.48
Canceled/Expired	(7,499)	(119,923)	(188,257)
Canceled/Expired (in Dollars per share)	$ 24.58	$ 23.21	$ 26.62
Outstanding at December 31, 2013	1,208,824	1,216,809	1,107,712
Outstanding at December 31, 2013 (in Dollars per share)	$ 18.54	$ 18.46	$ 18.98
Exercisable at December 31, 2013	933,738	758,270	690,449
Exercisable at December 31, 2013 (in Dollars per share)	$ 17.84	$ 16.80	$ 16.82
Expense recorded	$ 3.0	$ 4.0	$ 3.7
Unrecognized pre-tax expense	7.5
Remaining period for recognition	1 year 10 months 24 days
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Options, General Term	7 years
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Options, General Term	10 years
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expense recorded	1.7	2.1	2.0
Unrecognized pre-tax expense	$ 1.1
Remaining period for recognition	1 year 4 months 24 days