|
Note 2 - Cash, Cash Equivalents and Investments (Details) - Unrealized Gains And Losses On Investments (USD $)
In Thousands, unless otherwise specified
|
12 Months Ended |
|
Dec. 31, 2013
|
Dec. 31, 2012
|
| Note 2 - Cash, Cash Equivalents and Investments (Details) - Unrealized Gains And Losses On Investments [Line Items] |
|
|
| Adjusted Cost |
$ 173,931 |
$ 113,687 |
| Unrealized Gains |
26 |
45 |
| Unrealized Losses |
(383) |
(497) |
| Total Fair Value |
173,574 |
113,235 |
| Fair Value of Investments in Unrealized Loss Position |
52,740 |
25,876 |
|
Money Market Funds [Member]
|
|
|
| Note 2 - Cash, Cash Equivalents and Investments (Details) - Unrealized Gains And Losses On Investments [Line Items] |
|
|
| Adjusted Cost |
35,588 |
15,959 |
| Unrealized Gains |
0 |
0 |
| Total Fair Value |
35,588 |
15,959 |
|
US Government Agencies Short-term Debt Securities [Member]
|
|
|
| Note 2 - Cash, Cash Equivalents and Investments (Details) - Unrealized Gains And Losses On Investments [Line Items] |
|
|
| Adjusted Cost |
128,123 |
85,483 |
| Unrealized Gains |
26 |
45 |
| Unrealized Losses |
(23) |
(7) |
| Total Fair Value |
128,126 |
85,521 |
| Fair Value of Investments in Unrealized Loss Position |
42,880 |
14,121 |
|
Auction Rate Securities [Member]
|
|
|
| Note 2 - Cash, Cash Equivalents and Investments (Details) - Unrealized Gains And Losses On Investments [Line Items] |
|
|
| Adjusted Cost |
10,220 |
12,245 |
| Unrealized Losses |
(360) |
(490) |
| Total Fair Value |
9,860 |
11,755 |
| Fair Value of Investments in Unrealized Loss Position |
$ 9,860 |
$ 11,755 |