Note 6 - Equity-Based Compensation (Detail) - Summary of Deferred Stock Unit Activity (USD $)	Deferred Stock Units [Member]	Weighted Average Award Date Fair Value [Member]
Outstanding at January 1, 2011 (in Shares) at Dec. 31, 2010	163,318
Outstanding at January 1, 2011 at Dec. 31, 2010		19.43
Awarded		25.66
Awarded (in Shares)	25,601
Shares distributed (in Shares)	(5,681)
Shares distributed		14.18
Outstanding at June 30, 2011 (in Shares) at Jun. 30, 2011	183,238
Outstanding at June 30, 2011 at Jun. 30, 2011		20.46

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).

+ References+ Details

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References+ Details

- Definition

The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

+ References+ Details