Note 13 - Share-Based Compensation (Detail) - Summary of Stock-Settled Stock Appreciation Rights Transactions (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Outstanding	614,917	671,500	699,790
Outstanding (in Dollars per share)	$ 11.24	$ 10.66	$ 10.29
Granted	194,223	211,631
Granted (in Dollars per share)	$ 12.62	$ 11.43
Exercised	138,252	117,846
Exercised (in Dollars per share)	$ 9.32	$ 8.97
Lapsed	(86,400)	(93,025)
Lapsed (in Dollars per share)	$ 12.57	$ 11.65
Cancelled	(26,154)	(29,050)
Cancelled (in Dollars per share)	$ 12.37	$ 10.84
Stock Appreciation Rights (SARs) [Member]
Outstanding	176,476	257,424	207,380
Outstanding (in Dollars per share)	$ 11.60	$ 11.32	$ 11.30
Granted	65,752	127,144
Granted (in Dollars per share)	$ 13.15	$ 11.24
Exercised	(134,304)	(2,100)
Exercised (in Dollars per share)	$ 11.67	$ 9.16
Lapsed		(75,000)
Lapsed (in Dollars per share)		$ 11.20
Cancelled	(12,396)
Cancelled (in Dollars per share)	$ 13.15