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Note 2 - Fair Value Measurements (Detail) - Level 3 Investments (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Ending Balances	$ 13,675	$ 19,180
Sales and Settlement at Par	(2,100)	(5,775)
Included in interest income and other, net	40
Included in other comprehensive income	140
Unrealized gain		270
Ending Balances	$ 11,755	$ 13,675

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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