Note 1 - Basis of Presentation (Details) - Earnings Per Share (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013
Earnings Per Share [Abstract]
Net income (in Dollars)	$ 9,908	$ 6,576	$ 14,261	$ 10,718	$ 12,513
Average common shares outstanding	16,318	16,415	16,294		16,466
Average potential dilutive common shares	43	3	43		3
Average diluted common shares	16,361	16,418	16,337		16,469
Basic earnings per share (in Dollars per share)	$ 0.61	$ 0.40	$ 0.88		$ 0.76
Diluted earnings per share (in Dollars per share)	$ 0.60	$ 0.40	$ 0.87		$ 0.76