Note 13 - Fair Value Measurements (Detail) - Fair Value, Assets Measured on Recurring Basis (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Assets at fair value	$ 26,135	$ 26,123
Fair Value, Inputs, Level 1 [Member] \| Money Market Mutual Funds [Member]
Assets at fair value	25,351	25,339
Fair Value, Inputs, Level 1 [Member]
Assets at fair value	25,351	25,339
Fair Value, Inputs, Level 3 [Member] \| Auction Rate Securities [Member]
Assets at fair value	784	784
Fair Value, Inputs, Level 3 [Member]
Assets at fair value	784	784
Money Market Mutual Funds [Member]
Assets at fair value	25,351	25,339
Auction Rate Securities [Member]
Assets at fair value	$ 784	$ 784

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents investment securities as of the balance sheet date which may include marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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