Note 2 - Earnings Per Share ("EPS") (Detail) - Basic and Diluted EPS Computation (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011
Net income (in Dollars)	$ 6,536	$ 6,746	$ 12,891	$ 13,562	$ 11,812
Average common shares outstanding	17,044	17,342	17,130		17,320
Average potential dilutive common shares	5	33	4		33
Average diluted common shares	17,049	17,375	17,134		17,353
Basic earnings per share (in Dollars per share)	$ 0.38	$ 0.39	$ 0.75		$ 0.68
Diluted earnings per share (in Dollars per share)	$ 0.38	$ 0.39	$ 0.75		$ 0.68