Note 7 - Equity-Based Compensation (Detail) - Stock Option Activity (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Outstanding at January 1	1,107,712	1,198,516	1,167,640
Outstanding at January 1 (in Dollars per share)	$ 18.98	$ 18.42	$ 17.71
Granted	281,696	225,505	215,722
Granted (in Dollars per share)	$ 18.11	$ 26.92	$ 22.87
Exercised	(52,676)	(128,052)	(132,485)
Exercised (in Dollars per share)	$ 16.66	$ 16.48	$ 17.16
Forfeited/expired	(119,923)	(188,257)	(52,361)
Forfeited/expired (in Dollars per share)	$ 23.21	$ 26.62	$ 25.53
Outstanding at December 31	1,216,809	1,107,712	1,198,516
Outstanding at December 31 (in Dollars per share)	$ 18.46	$ 18.98	$ 18.42
Exercisable at December 31	758,270	690,449	678,649
Exercisable at December 31 (in Dollars per share)	$ 16.80	$ 16.82	$ 19.37

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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