Note 13 - Stock Based Compensation (Details) - Stock Compensation Plans (USD $)	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Stock Compensation Plans [Abstract]
Balance, January 1, 2013	217,650
Balance, January 1, 2013 (in Dollars per share)	$ 26.77
Balance, January 1, 2013	134,730
Balance, January 1, 2013 (in Dollars per share)	$ 25.89
Granted	64,006
Granted (in Dollars per share)	$ 25.57
Stock Options Exercised	(4,000)	0
Stock Options Exercised (in Dollars per share)	$ 23.78
Stock Awards Vested	(46,975)
Stock Awards Vested (in Dollars per share)	$ 26.92
Forfeited/Expired	(2,522)
Forfeited/Expired (in Dollars per share)	$ 26.88
Balance, June 30, 2013	211,128
Balance, June 30, 2013 (in Dollars per share)	$ 26.82
Balance, June 30, 2013	151,761
Balance, June 30, 2013 (in Dollars per share)	$ 25.52
Exercisable, June 30, 2013	211,128
Exercisable, June 30, 2013 (in Dollars per share)	$ 26.82