Note 7 - Equity-based Compensation (Details) - Summary of Deferred Stock Unit Activity (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Note 6 - Stockholders' Equity and Equity Compensation (Details) - Summary of Deferred Stock Unit Activity [Line Items]
Deferred Stock Unit, Share Transfer Obligation (in Shares)	1		1
Expense recorded			$ 3.0	$ 4.0	$ 3.7
Deferred Stock Units [Member]
Note 6 - Stockholders' Equity and Equity Compensation (Details) - Summary of Deferred Stock Unit Activity [Line Items]
Stock Awards - Outstanding			181,518	173,916	163,318
Weighted Average Award Date Fair Value - Outstanding (in Dollars per share)			$ 19.06	$ 20.12	$ 19.43
Stock Awards - Awarded			39,966	41,734	31,238
Awarded (in Dollars per share)			$ 22.33	$ 17.78	$ 23.75
Shares distributed			(7,029)	(34,132)	(20,640)
Shares distributed (in Dollars per share)			$ 22.67	$ 22.90	$ 20.13
Stock Awards - Outstanding	214,455	181,518	214,455	181,518	173,916
Weighted Average Award Date Fair Value - Outstanding (in Dollars per share)	$ 19.56	$ 19.06	$ 19.56	$ 19.06	$ 20.12
Expense recorded	$ 0	$ 0	$ 0.9	$ 0.7	$ 0.7

Number of shares Company is obligated to transfer for each deferred stock unit

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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