Note 4 - Stock Benefit Plans (Detail) - Stock Option Activity: (USD $) In Thousands, except Per Share data, unless otherwise specified	9 Months Ended	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2012	Dec. 31, 2011
Outstanding (in Shares)	488	94	80
Outstanding	$ 40.50	$ 31.89	$ 35.61
Outstanding		7 years 277 days
Options vested and expected to vest at
December 31, 2012 (in Shares)		65
December 31, 2012		$ 30.93
December 31, 2012		7 years 277 days
Options exercisable at:
Exercisable (in Shares)	69	46	68
Exercisable	$ 36.60	$ 31.98	$ 33.12
Exercisable		7 years 76 days
Granted (in Shares)	9	3	28
Granted	$ 29.30	$ 13.32	$ 28.73
Exercised (in Shares)	(76)		(1)
Exercised	$ 28.50		$ 28.60
Forfeited (in Shares)		(5)	(1)
Forfeited	$ 38.70	$ 37.60	$ 28.40
Expired (in Shares)	(341)	(27)	(12)
Expired	$ 44.00	$ 46.16	$ 48.32
Outstanding (in Shares)	80	65	94
Outstanding	$ 35.61	$ 30.93	$ 31.89