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Investments | 3 Months Ended
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Mar. 31, 2013
Investments |
Investments | (4) Investments The amortized cost and estimated fair values of available-for-sale securities by balance sheet classification are as follows:
As of March 31, 2013 |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |
Municipal obligations |  | $ | 606 |  | $ | 26 |  | $ | — |  | $ | 632 |
U.S. government securities funds |  | 995 |  | — |  | (8 | ) | 987 |
Equity securities |  | 227 |  | 267 |  | (3 | ) | 491 |
Total short-term investment securities |  | $ | 1,828 |  | $ | 293 |  | $ | (11 | ) | $ | 2,110 |
As of December 31, 2012 |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |
Municipal obligations |  | $ | 608 |  | $ | 30 |  | $ | — |  | $ | 638 |
U.S. government securities funds |  | 995 |  | — |  | (9 | ) | 986 |
Equity securities |  | 227 |  | 228 |  | (8 | ) | 447 |
Total short-term investment securities |  | $ | 1,830 |  | $ | 258 |  | $ | (17 | ) | $ | 2,071 |
The municipal obligations held at a fair value of $632 at March 31, 2013 all mature in less than two years. During the three-month period ended March 31, 2013 and 2012, the proceeds from the sales of available-for-sale securities were $0 and $3,499, respectively. There were no gross realized gains (losses) on sales of available-for-sale securities (net of tax) for the three-month periods ended March 31, 2013 and 2012, respectively. The Company’s trading securities portfolio totaled $1,235 at March 31, 2013 and $1,276 at December 31, 2012, and generated gains of $45 and $86 for the three months ended March 31, 2013 and 2012. As of March 31, 2013 and December 31, 2012, the Company had unrealized losses of $8 and $9, respectively, in its U.S. government securities funds. These losses are due to the interest rate sensitivity of the municipal obligations and the performance of the overall stock market for the equity securities.

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