Note 3 - 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	Dec. 31, 2013	Dec. 31, 2012
Note 3 - 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	$ 104,448	$ 97,612
Unrealized losses	(576)	(136)
Estimated fair value	104,057	98,534
Due in One Year or Less [Member] | Debt Securities [Member]
Note 3 - 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	10,961	17,454
Unrealized gains	23	40
Unrealized losses		(1)
Estimated fair value	10,984	17,493
Due after One Year to Five Years [Member] | Debt Securities [Member]
Note 3 - 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	90,576
Unrealized gains	162
Unrealized losses	(576)
Estimated fair value	90,162
Due after one year to six years [Member] | Debt Securities [Member]
Note 3 - 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		77,450
Unrealized gains		1,018
Unrealized losses		(135)
Estimated fair value		78,333
Debt Securities [Member]
Note 3 - 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	101,537	94,904
Unrealized gains	185	1,058
Unrealized losses	(576)	(136)
Estimated fair value	$ 101,146	$ 95,826