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		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Earnings Per Common Share and Diluted Earnings Per Common Share [Abstract]
Net income (numerator) (in Dollars)	$ 15,154	$ 16,738	$ 45,618	$ 51,121
Weighted average number of common shares outstanding - basic	25,973	26,670	26,192	26,900
Add common stock equivalents for options	43	35	70	19
Weighted average number of common shares outstanding - diluted (denominator)	26,016	26,705	26,262	26,919
Diluted earnings per common share (in Dollars per share)	$ 0.58	$ 0.63	$ 1.74	$ 1.90
Basic earnings per common share (in Dollars per share)	$ 0.58	$ 0.63	$ 1.74	$ 1.90