Note 9 - Derivative Instruments (Details) In Thousands, unless otherwise specified	3 Months Ended			3 Months Ended
	Mar. 31, 2014 USD ($)	Mar. 31, 2013 USD ($)	Mar. 31, 2014 GBP (£)	Mar. 31, 2014 Foreign Exchange Contract [Member] USD ($)	Mar. 31, 2013 Foreign Exchange Contract [Member] USD ($)
Note 9 - Derivative Instruments (Details) [Line Items]
Revenues Denominated in U.S. Dollars, Percentage	25.00%
Foreign Currency Cash Flow Hedge Asset at Fair Value	$ 5,000		£ 3,107	$ 5,000
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	4	(507)		15	780
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax				$ 159	$ 223