|
Note 2 - Cash, Cash Equivalents and Investments (Details) - Fair Value Heirarchy (USD $)
In Thousands, unless otherwise specified
|
Dec. 31, 2013
|
Dec. 31, 2012
|
| Note 2 - Cash, Cash Equivalents and Investments (Details) - Fair Value Heirarchy [Line Items] |
|
|
| Available For Sale Securities |
$ 173,574 |
$ 113,235 |
|
Fair Value, Inputs, Level 1 [Member]
|
|
|
| Note 2 - Cash, Cash Equivalents and Investments (Details) - Fair Value Heirarchy [Line Items] |
|
|
| Available For Sale Securities |
35,588 |
15,959 |
|
Fair Value, Inputs, Level 2 [Member]
|
|
|
| Note 2 - Cash, Cash Equivalents and Investments (Details) - Fair Value Heirarchy [Line Items] |
|
|
| Available For Sale Securities |
128,126 |
85,521 |
|
Fair Value, Inputs, Level 3 [Member]
|
|
|
| Note 2 - Cash, Cash Equivalents and Investments (Details) - Fair Value Heirarchy [Line Items] |
|
|
| Available For Sale Securities |
9,860 |
11,755 |
|
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
|
|
|
| Note 2 - Cash, Cash Equivalents and Investments (Details) - Fair Value Heirarchy [Line Items] |
|
|
| Available For Sale Securities |
35,588 |
15,959 |
|
Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member]
|
|
|
| Note 2 - Cash, Cash Equivalents and Investments (Details) - Fair Value Heirarchy [Line Items] |
|
|
| Available For Sale Securities |
0 |
0 |
|
Money Market Funds [Member] | Fair Value, Inputs, Level 3 [Member]
|
|
|
| Note 2 - Cash, Cash Equivalents and Investments (Details) - Fair Value Heirarchy [Line Items] |
|
|
| Available For Sale Securities |
0 |
0 |
|
Money Market Funds [Member]
|
|
|
| Note 2 - Cash, Cash Equivalents and Investments (Details) - Fair Value Heirarchy [Line Items] |
|
|
| Available For Sale Securities |
35,588 |
15,959 |
|
US Government Agencies Short-term Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
|
|
|
| Note 2 - Cash, Cash Equivalents and Investments (Details) - Fair Value Heirarchy [Line Items] |
|
|
| Available For Sale Securities |
0 |
0 |
|
US Government Agencies Short-term Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
|
|
|
| Note 2 - Cash, Cash Equivalents and Investments (Details) - Fair Value Heirarchy [Line Items] |
|
|
| Available For Sale Securities |
128,126 |
85,521 |
|
US Government Agencies Short-term Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
|
|
|
| Note 2 - Cash, Cash Equivalents and Investments (Details) - Fair Value Heirarchy [Line Items] |
|
|
| Available For Sale Securities |
0 |
0 |
|
US Government Agencies Short-term Debt Securities [Member]
|
|
|
| Note 2 - Cash, Cash Equivalents and Investments (Details) - Fair Value Heirarchy [Line Items] |
|
|
| Available For Sale Securities |
128,126 |
85,521 |
|
Auction Rate Securities [Member] | Fair Value, Inputs, Level 3 [Member]
|
|
|
| Note 2 - Cash, Cash Equivalents and Investments (Details) - Fair Value Heirarchy [Line Items] |
|
|
| Available For Sale Securities |
9,860 |
11,755 |
|
Auction Rate Securities [Member]
|
|
|
| Note 2 - Cash, Cash Equivalents and Investments (Details) - Fair Value Heirarchy [Line Items] |
|
|
| Available For Sale Securities |
$ 9,860 |
$ 11,755 |