Note 1 - Basis Of Presentation (Detail) - Accumulated Other Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Balance as of December 31, 2012	$ 13,286
Current period other comprehensive income (loss)	(1,381)	664
Current period other comprehensive income (loss)	(4,858)	982
Current period other comprehensive income (loss)	(6,239)	1,646
Balance as of March 31, 2013	7,400
Balance as of March 31, 2013	7,047
Foreign Currency Translation Adjustment [Member]
Balance as of December 31, 2012	1,055
Current period other comprehensive income (loss)	(1,381)
Balance as of March 31, 2013	(326)
Unrealized Gain (Loss) on Investments [Member]
Balance as of December 31, 2012	12,231
Current period other comprehensive income (loss)	(4,858)
Balance as of March 31, 2013	7,373
Accumulated Other Comprehensive Income (Loss) [Member]
Balance as of December 31, 2012	13,286
Current period other comprehensive income (loss)	(6,239)
Balance as of March 31, 2013	$ 7,047