Note 9 - Employee Benefits (Detail) - Option activity in 2011: (USD $)	12 Months Ended
	Dec. 31, 2012
Shares	690,768
Weighted Average Exercise Price (in Dollars per share)	$ 17.62
Exercisable at December 31, 2012	465,144
Exercisable at December 31, 2012 (in Dollars per share)	$ 19.23
Granted	96,250
Granted (in Dollars per share)	$ 20.48
Exercised	(111,954)
Exercised (in Dollars per share)	$ 8.65
Forfeited	(11,700)
Forfeited (in Dollars per share)	$ 19.29
Shares	663,364
Weighted Average Exercise Price (in Dollars per share)	$ 19.52