4. Investment
Securities
Investment
securities, including investment securities available-for-sale and
investment securities classified as cash equivalents, consisted of
the following (in thousands):
|
|
|
|
|
|
|
|
|
|
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|
|
|
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|
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September 30,
2012 |
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|
|
Amortized
Cost |
|
|
Unrealized
Gains |
|
|
Unrealized
(Losses) |
|
|
Estimated
Fair
Value |
|
|
|
(unaudited) |
|
Government sponsored
enterprise securities
|
|
$ |
13,289 |
|
|
$ |
1 |
|
|
$ |
— |
|
|
$ |
13,290 |
|
Corporate debt
securities
|
|
|
3,003 |
|
|
|
— |
|
|
|
— |
|
|
|
3,003 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
$ |
16,292 |
|
|
$ |
1 |
|
|
$ |
— |
|
|
$ |
16,293 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
December 31,
2011 |
|
|
|
Amortized
Cost |
|
|
Unrealized
Gains |
|
|
Unrealized
(Losses) |
|
|
Estimated
Fair
Value |
|
U.S. Treasury
notes
|
|
$ |
1,516 |
|
|
$ |
— |
|
|
$ |
— |
|
|
$ |
1,516 |
|
Government sponsored
enterprise securities
|
|
|
9,827 |
|
|
|
2 |
|
|
|
(1 |
) |
|
|
9,828 |
|
Corporate debt
securities
|
|
|
12,812 |
|
|
|
3 |
|
|
|
— |
|
|
|
12,815 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
$ |
24,155 |
|
|
$ |
5 |
|
|
$ |
(1 |
) |
|
$ |
24,159 |
|
|
|
|
|
|
|
|
|
|
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|
|
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|