Note 1 - Summary of Significant Accounting Policies (Details) - Effect of Accounting Change on Interim Financial Statements: Interim Condensed Consolidated Statement of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net Income	$ 16,589	$ 19,877	$ 14,342	$ 13,805	$ 15,895	$ 17,196	$ 13,555	$ 12,654	$ 64,613	$ 59,300	$ 64,990
Comprehensive Income									59,990	73,406	65,405
Previously Reported [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net Income										57,957	64,072
Comprehensive Income										72,063	64,487
Adjustments for New Accounting Pronouncement [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net Income										1,343	918
Comprehensive Income										1,343	918
As Adjusted [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net Income										59,300	64,990
Comprehensive Income										$ 73,406	$ 65,405