Note 7 - Equity-based Compensation (Details) - Summary of Deferred Stock Unit Activity (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
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
Expense recorded	$ 3,600	$ 3,000	$ 4,100
Deferred Stock Units [Member]
Note 6 - Stockholders' Equity and Equity Compensation (Details) - Summary of Deferred Stock Unit Activity [Line Items]
Stock Awards - Outstanding	214,455	181,518	173,916
Weighted Average Award Date Fair Value - Outstanding (in Dollars per share)	$ 19.56	$ 19.06	$ 20.12
Stock Awards - Awarded	38,810	39,966	41,734
Awarded (in Dollars per share)	$ 22.89	$ 22.33	$ 17.78
Shares distributed	(31,794)	(7,029)	(34,132)
Shares distributed (in Dollars per share)	$ 19.70	$ 22.67	$ 22.90
Stock Awards - Outstanding	221,471	214,455	181,518
Weighted Average Award Date Fair Value - Outstanding (in Dollars per share)	$ 20.10	$ 19.56	$ 19.06
Expense recorded	$ 890	$ 890	$ 700

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 weighted average fair value at grant date for nonvested equity-based awards issued 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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