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Note 8 - Fair Value Measurements (Detail) - Level 3 Investments (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2009
Balance	$ 11,755	$ 6,300
Sales and settlement at par	(25)
Total realized and unrealized gains (losses):
Included in interest income and other, net	0
Included in other comprehensive income	(15)
Balance	$ 11,715	$ 6,300

The aggregate net change in the difference between the fair value and the carrying value, or in the comparative fair values, of marketable securities categorized as trading held at each balance sheet date, that was included in earnings for the period, which may have arisen from (a) securities classified as trading, (b) the unrealized holding gain (loss) on held-to-maturity securities transferred to the trading security category, and (c) the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) on available-for-sale securities transferred to trading securities during the period.

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