|
Note 2 - Cash, Cash Equivalents and Investments (Tables)
|
6 Months Ended |
12 Months Ended |
|
Jun. 30, 2012
|
Dec. 31, 2013
|
| Fair Value Disclosures [Abstract] |
|
|
| Fair Value, by Balance Sheet Grouping [Table Text Block] |
|
|
|
|
Estimated Fair Market Value as of
|
|
|
|
|
December 31,
2013
|
|
|
December 31,
2012
|
|
|
Cash, cash equivalents and investments:
|
|
|
|
|
|
|
|
|
|
Cash
|
|
$
|
62,625
|
|
|
$
|
59,145
|
|
|
Money market funds
|
|
|
35,588
|
|
|
|
15,959
|
|
|
U.S. treasuries and government agency bonds
|
|
|
128,126
|
|
|
|
85,521
|
|
|
Auction-rate securities backed by student-loan notes
|
|
|
9,860
|
|
|
|
11,755
|
|
|
Total cash, cash equivalents and investments
|
|
$
|
236,199
|
|
|
$
|
172,380
|
|
|
| Schedule of Other Current Assets [Table Text Block] |
|
|
Reported as:
|
|
December 31,
2013
|
|
|
December 31,
2012
|
|
|
Cash and cash equivalents
|
|
$
|
101,213
|
|
|
$
|
75,104
|
|
|
Short-term investments
|
|
|
125,126
|
|
|
|
85,521
|
|
|
Long-term investments
|
|
|
9,860
|
|
|
|
11,755
|
|
|
Total cash, cash equivalents and investments
|
|
$
|
236,199
|
|
|
$
|
172,380
|
|
|
| Investments Classified by Contractual Maturity Date [Table Text Block] |
|
|
|
|
December 31,
2013
|
|
|
December 31,
2012
|
|
|
Due in less than 1 year
|
|
$
|
95,509
|
|
|
$
|
52,880
|
|
|
Due in 1 - 5 years
|
|
|
29,617
|
|
|
|
32,641
|
|
|
Due in greater than 5 years
|
|
|
9,860
|
|
|
|
11,755
|
|
|
|
|
$
|
134,986
|
|
|
$
|
97,276
|
|
|
| Unrealized Gain (Loss) on Investments [Table Text Block] |
|
|
|
|
As of December 31, 2013
|
|
|
|
|
Adjusted Cost
|
|
|
Unrealized Gains
|
|
|
Unrealized Losses
|
|
|
Total Fair Value
|
|
|
Fair Value of Investments in Unrealized Loss Position
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Money market funds
|
|
$
|
35,588
|
|
|
$
|
-
|
|
|
$
|
-
|
|
|
$
|
35,588
|
|
|
$
|
-
|
|
|
U.S. treasuries and government agency bonds
|
|
|
128,123
|
|
|
|
26
|
|
|
|
(23
|
)
|
|
|
128,126
|
|
|
|
42,880
|
|
|
Auction-rate securities backed by student-loan notes
|
|
|
10,220
|
|
|
|
-
|
|
|
|
(360
|
)
|
|
|
9,860
|
|
|
|
9,860
|
|
|
|
|
$
|
173,931
|
|
|
$
|
26
|
|
|
$
|
(383
|
)
|
|
$
|
173,574
|
|
|
$
|
52,740
|
|
|
|
|
As of December 31, 2012
|
|
|
|
|
Adjusted Cost
|
|
|
Unrealized Gains
|
|
|
Unrealized Losses
|
|
|
Total Fair Value
|
|
|
Fair Value of Investments in Unrealized Loss Position
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Money market funds
|
|
$
|
15,959
|
|
|
$
|
-
|
|
|
$
|
-
|
|
|
$
|
15,959
|
|
|
$
|
-
|
|
|
U.S. treasuries and government agency bonds
|
|
|
85,483
|
|
|
|
45
|
|
|
|
(7
|
)
|
|
|
85,521
|
|
|
|
14,121
|
|
|
Auction-rate securities backed by student-loan notes
|
|
|
12,245
|
|
|
|
-
|
|
|
|
(490
|
)
|
|
|
11,755
|
|
|
|
11,755
|
|
|
|
|
$
|
113,687
|
|
|
$
|
45
|
|
|
$
|
(497
|
)
|
|
$
|
113,235
|
|
|
$
|
25,876
|
|
|
| Fair Value, Assets Measured on Recurring Basis [Table Text Block] |
|
|
|
|
Fair Value Measurement at December 31, 2013
|
|
|
|
|
|
|
|
|
Quoted Prices in Active Markets for Identical Assets
|
|
|
Significant Other Observable Inputs
|
|
|
Significant Unobservable
Inputs
|
|
|
|
|
Total
|
|
|
Level 1
|
|
|
Level 2
|
|
|
Level 3
|
|
|
Money market funds
|
|
$
|
35,588
|
|
|
$
|
35,588
|
|
|
$
|
-
|
|
|
$
|
-
|
|
|
U.S. treasuries and government agency bonds
|
|
|
128,126
|
|
|
|
-
|
|
|
|
128,126
|
|
|
|
-
|
|
|
Auction-rate securities backed by student-loan notes
|
|
|
9,860
|
|
|
|
-
|
|
|
|
-
|
|
|
|
9,860
|
|
|
|
|
$
|
173,574
|
|
|
$
|
35,588
|
|
|
$
|
128,126
|
|
|
$
|
9,860
|
|
|
|
|
Fair Value Measurement at December 31, 2012
|
|
|
|
|
|
|
|
|
Quoted Prices in Active Markets for Identical Assets
|
|
|
Significant Other Observable Inputs
|
|
|
Significant Unobservable
Inputs
|
|
|
|
|
Total
|
|
|
Level 1
|
|
|
Level 2
|
|
|
Level 3
|
|
|
Money market funds
|
|
$
|
15,959
|
|
|
$
|
15,959
|
|
|
$
|
-
|
|
|
$
|
-
|
|
|
U.S. treasuries and government agency bonds
|
|
|
85,521
|
|
|
|
-
|
|
|
|
85,521
|
|
|
|
-
|
|
|
Auction-rate securities backed by student-loan notes
|
|
|
11,755
|
|
|
|
-
|
|
|
|
-
|
|
|
|
11,755
|
|
|
|
|
$
|
113,235
|
|
|
$
|
15,959
|
|
|
$
|
85,521
|
|
|
$
|
11,755
|
|
|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] |
|
|
Beginning balance at January 1, 2012
|
|
$
|
13,675
|
|
|
Sales and settlement at par
|
|
|
(2,100
|
)
|
|
Realized gain included in interest and other income, net
|
|
|
40
|
|
|
Change in unrealized loss included in other comprehensive income
|
|
|
140
|
|
|
Balance at December 31, 2012
|
|
|
11,755
|
|
|
Sales and settlement at par
|
|
|
(2,025
|
)
|
|
Change in unrealized loss included in other comprehensive income
|
|
|
130
|
|
|
Ending balance at December 31, 2013
|
|
$
|
9,860
|
|
|
| Schedule of Defined Benefit Plans Disclosures [Table Text Block] |
|
|
At December 31, 2013
|
At December 31, 2012
|
|
Time-to-liquidity (months)
|
|
24
|
|
|
24
|
|
|
Expected return
|
|
2.5%
|
|
|
1.8%
|
|
|
Discount rate
|
3.3%
|
-
|
8.1%
|
2.5%
|
-
|
7.3%
|
|
|