Note 13 - Fair Value Measurements (Detail) - Level 3 Assets Reconciliation (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2012 Fair Value, Inputs, Level 3 [Member]	Mar. 31, 2013 Fair Value, Inputs, Level 3 [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 3 [Member]
Corporate and Other Securities:
Balance, beginning of period			$ 405	$ 415	$ 415
Decrease in unrealized loss	(432)	556	2
Balance, end of period	$ 299,073		$ 407	$ 415	$ 415