Note 2 - Summary of Significant Accounting Policies (Details) - Accumulated Other Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at December 31, 2011	$ (6,625)	$ 3,356	$ (1,429)
Balance at December 31, 2011	(5,937)	3,183	(1,429)
Change during 2012:
Before-tax amount	14,706	5,798
Before-tax amount	13,281	5,513
Tax (expense) benefit	(4,725)	(1,013)
Tax (expense) benefit	(4,161)	(901)
Change during 2013:
Before-tax amount	(14,706)	(5,798)
Before-tax amount	(13,281)	(5,513)
Tax (expense) benefit	4,725	1,013
Tax (expense) benefit	4,161	901
Total activity in 2012	9,981	4,785
Total activity in 2012	(9,120)	4,612	(2,645)
Balance at December 31, 2012	(6,625)	3,356	(1,429)
Balance at December 31, 2012	(5,937)	3,183	(1,429)
Change during 2012:
Before-tax amount	14,706	5,798
Before-tax amount	13,281	5,513
Tax (expense) benefit	(4,725)	(1,013)
Tax (expense) benefit	(4,161)	(901)
Change during 2013:
Before-tax amount	(14,706)	(5,798)
Before-tax amount	(13,281)	(5,513)
Tax (expense) benefit	4,725	1,013
Tax (expense) benefit	4,161	901
Total activity in 2013	(9,981)	(4,785)
Total activity in 2013	(9,120)	4,612	(2,645)
Balance at December 31, 2013	(6,625)	3,356	(1,429)
Balance at December 31, 2013	(5,937)	3,183	(1,429)
Change during 2012:
Before-tax amount	14,706	5,798
Before-tax amount	13,281	5,513
Tax (expense) benefit	(4,725)	(1,013)
Tax (expense) benefit	(4,161)	(901)
Change during 2013:
Before-tax amount	(14,706)	(5,798)
Before-tax amount	(13,281)	(5,513)
Tax (expense) benefit	4,725	1,013
Tax (expense) benefit	4,161	901
Investment Hedge Foreign Exchange Contract [Member]
Change during 2012:
Before-tax amount	(799)
Tax (expense) benefit	316
Change during 2013:
Before-tax amount	799
Tax (expense) benefit	(316)
Total activity in 2012	(483)
Balance at December 31, 2012	483
Change during 2012:
Before-tax amount	(799)
Tax (expense) benefit	316
Change during 2013:
Before-tax amount	799
Tax (expense) benefit	(316)
Total activity in 2013	483
Balance at December 31, 2013	483
Change during 2012:
Before-tax amount	(799)
Tax (expense) benefit	316
Change during 2013:
Before-tax amount	799
Tax (expense) benefit	(316)
Investment Hedge Australian Denominated Debt [Member]
Change during 2012:
Before-tax amount	(626)	(285)
Tax (expense) benefit	248	112
Change during 2013:
Before-tax amount	626	285
Tax (expense) benefit	(248)	(112)
Total activity in 2012	(378)	(173)
Balance at December 31, 2012	205	(173)
Change during 2012:
Before-tax amount	(626)	(285)
Tax (expense) benefit	248	112
Change during 2013:
Before-tax amount	626	285
Tax (expense) benefit	(248)	(112)
Total activity in 2013	378	173
Balance at December 31, 2013	205	(173)
Change during 2012:
Before-tax amount	(626)	(285)
Tax (expense) benefit	248	112
Change during 2013:
Before-tax amount	626	285
Tax (expense) benefit	$ (248)	$ (112)