Note 3 - Earnings Per Share (Detail) - Earnings per common share (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Net income, as reported (in Dollars)	$ 6,756		$ 7,129
Divided by:
Weighted average common shares outstanding	30,449		30,396
Weighted average common stock equivalents	32		24
Total weighted average common shares outstanding and common stock equivalents	30,481		30,420
Basic earnings per common share (in Dollars per share)	$ 0.22		$ 0.23
Diluted earnings per common share (1) (in Dollars per share)	$ 0.22	[1]	$ 0.23	[1]
Dividend payout ratio	59.10%		56.50%

[1] For the three months ended March 31, 2013, options to purchase 542,400 shares at an average exercise price of $17.66 were not included in the computation of diluted earnings per common share as they were anti-dilutive. For the three months ended March 31, 2012, options to purchase 720,340 shares at an average exercise price of $16.71were not included in the computation of diluted earnings per common share as they were anti-dilutive.