Note 6 - Financial Instruments and Fair Value (Details) - Investment in Auction Rate Securities (Auction Rate Securities [Member], USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
Jun. 30, 2014	Dec. 31, 2013
Auction Rate Securities [Member]
Note 6 - Financial Instruments and Fair Value (Details) - Investment in Auction Rate Securities [Line Items]
Cost Basis Amount	$ 7,425	$ 7,575
Gross Unrealized (Gain) Loss In Accumulated OCI	613	947
Fair Value	$ 6,812	$ 6,628

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities.

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