Note 4 - Marketable Securities And Time Deposits (Details) - Amortized Cost of Short-Term Deposits and Available-For-Sale Debt Securities by Contractual Maturities (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Note 4 - Marketable Securities And Time Deposits (Details) - Amortized Cost of Short-Term Deposits and Available-For-Sale Debt Securities by Contractual Maturities [Line Items]
Amortized cost	$ 102,290	$ 104,448
Unrealized losses	(393)
Estimated fair value	102,104	104,057
Debt Securities [Member] | Due in One Year or Less [Member]
Note 4 - Marketable Securities And Time Deposits (Details) - Amortized Cost of Short-Term Deposits and Available-For-Sale Debt Securities by Contractual Maturities [Line Items]
Amortized cost	10,368
Unrealized gains	10
Unrealized losses	(1)
Estimated fair value	10,377
Debt Securities [Member] | Due after One Year to Five Years [Member]
Note 4 - Marketable Securities And Time Deposits (Details) - Amortized Cost of Short-Term Deposits and Available-For-Sale Debt Securities by Contractual Maturities [Line Items]
Amortized cost	91,922
Unrealized gains	197
Unrealized losses	(392)
Estimated fair value	91,727
Debt Securities [Member]
Note 4 - Marketable Securities And Time Deposits (Details) - Amortized Cost of Short-Term Deposits and Available-For-Sale Debt Securities by Contractual Maturities [Line Items]
Amortized cost	102,290
Unrealized gains	207
Unrealized losses	(393)
Estimated fair value	$ 102,104