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Note 4 - Cash Equivalents, Short-term and Long-term Investments (Detail) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Available-for-sale Securities, Gross Realized Gain (Loss)	$ 11,000	$ 0	$ 11,000	$ 0
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities			$ 0		$ 0

The amount by which the fair value of an investment in debt and equity securities categorized as Available-for-sale is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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