Note 11 - Earnings Per Common Share (Details) - Earnings Per Common Share and Diluted Earnings Per Common Share (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Earnings Per Common Share and Diluted Earnings Per Common Share [Abstract]
Net income (numerator) (in Dollars)	$ 15,307	$ 17,271
Weighted average number of common shares outstanding - basic	26,433	27,145
Add exercise of options reduced by the number of shares that could have been purchased with the proceeds of such exercise	104	12
Weighted average number of common shares outstanding - diluted (denominator)	26,537	27,157
Diluted earnings per common share (in Dollars per share)	$ 0.58	$ 0.64
Basic earnings per common share (in Dollars per share)	$ 0.58	$ 0.64