Note 1 - Basis of Presentation (Details) - Following is the computation of per share earnings for the three and nine months ended September 30, (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Following is the computation of per share earnings for the three and nine months ended September 30, [Abstract]
Net income (in Dollars)	$ 6,932	$ 8,033	$ 6,760	$ 19,445	$ 19,651
Average common shares outstanding	16,220		16,757	16,383	17,005
Average potential dilutive common shares	5		3	5	3
Average diluted common shares	16,225		16,760	16,388	17,008
Basic earnings per share (in Dollars per share)	$ 0.43		$ 0.41	$ 1.19	$ 1.16
Diluted earnings per share (in Dollars per share)	$ 0.43		$ 0.41	$ 1.19	$ 1.16