Note 2 - Summary of Significant Accounting Policies (Details) - Accumulated Other Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Abstract]
Balance at December 31, 2014			$ (17,821)
Balance at December 31, 2014			3,445
Balance at December 31, 2014			(14,376)
Change during 2015:
Before-tax amount			(18,818)
Before-tax amount			6,201
Before-tax amount			(12,617)
Tax (expense) benefit			6,399
Tax (expense) benefit			(2,452)
Tax (expense) benefit			3,947
Total activity in 2015			(12,419)
Total activity in 2015			3,749
Total activity in 2015	$ (4,607)	$ (4,956)	(8,670)	$ (3,985)
Balance at September 30, 2015	(30,240)		(30,240)
Balance at September 30, 2015	7,194		7,194
Balance at September 30, 2015	$ (23,046)		$ (23,046)