Note 1 - Summary of Significant Accounting Policies (Details) - Stock Option Activity and Stock Options Outstanding (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended
	Jun. 30, 2013
Note 1 - Summary of Significant Accounting Policies (Details) - Stock Option Activity and Stock Options Outstanding [Line Items]
Exercised	(16,732)
Exercised (in Dollars per share)	$ 39.58	[1]
Expired	(13,500)
Expired (in Dollars per share)	$ 40.50	[1]
Options Outstanding [Member]
Note 1 - Summary of Significant Accounting Policies (Details) - Stock Option Activity and Stock Options Outstanding [Line Items]
Options outstanding at January 1, 2013	276,432
Options outstanding at January 1, 2013 (in Dollars per share)	$ 39.14	[1]
Options outstanding at January 1, 2013	2 years 109 days	[1]
Options Exercisable [Member]
Note 1 - Summary of Significant Accounting Policies (Details) - Stock Option Activity and Stock Options Outstanding [Line Items]
Options outstanding and exercisable at June 30, 2013	246,200
Options outstanding and exercisable at June 30, 2013 (in Dollars per share)	$ 39.03	[1]
Options outstanding and exercisable at June 30, 2013	1 year 281 days	[1]
Options outstanding and exercisable at June 30, 2013 (in Dollars)	$ 4,111

[1] Weighted average