|
Note 2 - Significant Accounting Policies (Tables)
|
12 Months Ended |
|
Dec. 31, 2014
|
| Accounting Policies [Abstract] |
|
| Unrealized Gain (Loss) on Investments [Table Text Block] |
|
|
|
Amortized
Cost
|
|
|
Gross
Unrealized
Gains
|
|
|
Gross
Unrealized
Losses
|
|
|
Fair Value
|
|
|
|
|
(In thousands)
|
|
|
As of December 31, 2014:
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Cash
|
|
$
|
6,351
|
|
|
$
|
—
|
|
|
$
|
—
|
|
|
$
|
6,351
|
|
|
Money market funds
|
|
|
4,103
|
|
|
|
—
|
|
|
|
—
|
|
|
|
4,103
|
|
|
Debt securities of U.S. government agencies
|
|
|
43,862
|
|
|
|
1
|
|
|
|
(19
|
)
|
|
|
43,844
|
|
|
Corporate bonds
|
|
|
9,423
|
|
|
|
2
|
|
|
|
(9
|
)
|
|
|
9,416
|
|
|
Total
|
|
$
|
63,739
|
|
|
$
|
3
|
|
|
$
|
(28
|
)
|
|
$
|
63,714
|
|
|
As of December 31, 2013:
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Cash
|
|
$
|
3,221
|
|
|
$
|
—
|
|
|
$
|
—
|
|
|
$
|
3,221
|
|
|
Money market funds
|
|
|
6,058
|
|
|
|
—
|
|
|
|
—
|
|
|
|
6,058
|
|
|
Debt securities of U.S. government agencies
|
|
|
49,878
|
|
|
|
18
|
|
|
|
(6
|
)
|
|
|
49,890
|
|
|
Corporate bonds
|
|
|
13,390
|
|
|
|
4
|
|
|
|
(1
|
)
|
|
|
13,393
|
|
|
Total
|
|
$
|
72,547
|
|
|
$
|
22
|
|
|
$
|
(7
|
)
|
|
$
|
72,562
|
|
|
| Investments Classified by Contractual Maturity Date [Table Text Block] |
|
|
|
As of December 31, 2014
|
|
|
As of December 31, 2013
|
|
|
|
|
Amortized Cost
|
|
|
Fair Value
|
|
|
Amortized Cost
|
|
|
Fair Value
|
|
|
|
|
(In thousands)
|
|
|
Less than one year
|
|
$
|
51,338
|
|
|
$
|
51,319
|
|
|
$
|
56,789
|
|
|
$
|
56,806
|
|
|
Greater than one year but less than five years
|
|
|
6,050
|
|
|
|
6,044
|
|
|
|
12,537
|
|
|
|
12,535
|
|
|
Total
|
|
$
|
57,388
|
|
|
$
|
57,363
|
|
|
$
|
69,326
|
|
|
$
|
69,341
|
|
|
| Schedule of Property Plant and Equipment Estimated Useful Lives [Table Text Block] |
|
|
|
|
Scientific and office equipment (years)
|
5
|
|
Computer software and equipment (years)
|
3
|
|
Leasehold improvements and leased equipment
|
Shorter of useful life or the term of the lease
|
|
| Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] |
|
|
|
Net unrealized
gains/(losses) on
Available-for-sale
Securities
|
|
|
Foreign
Currency
Translation
Adjustment
|
|
|
Accumulated
Other
Comprehensive
Loss
|
|
|
|
|
(In thousands)
|
|
|
Balance at December 31, 2011
|
|
$
|
22
|
|
|
$
|
(5,066
|
)
|
|
$
|
(5,044
|
)
|
|
Other comprehensive income
|
|
|
8
|
|
|
|
—
|
|
|
|
8
|
|
|
Balance at December 31, 2012
|
|
|
30
|
|
|
|
(5,066
|
)
|
|
|
(5,036
|
)
|
|
Other comprehensive loss
|
|
|
(15
|
)
|
|
|
—
|
|
|
|
(15
|
)
|
|
Balance at December 31, 2013
|
|
|
15
|
|
|
|
(5,066
|
)
|
|
|
(5,051
|
)
|
|
Other comprehensive loss
|
|
|
(40
|
)
|
|
|
—
|
|
|
|
(40
|
)
|
|
Balance at December 31, 2014
|
|
$
|
(25
|
)
|
|
$
|
(5,066
|
)
|
|
$
|
(5,091
|
)
|
|