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Investments | 3 Months Ended
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Mar. 31, 2015
Investments |
Investments | (5)Investments The amortized cost and estimated fair values of available-for-sale securities by balance sheet classification are as follows:
As of March 31, 2015 |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |
Municipal obligations |  | $ | 100 |  | $ | — |  | $ | — |  | $ | 100 |
U.S. government securities funds |  | 1,791 |  | — |  | (8 | ) | 1,783 |
Equity securities |  | 227 |  | 472 |  | (13 | ) | 686 |
Total short-term investment securities |  | $ | 2,118 |  | $ | 472 |  | $ | (21 | ) | $ | 2,569 |
As of December 31, 2014 |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |
Municipal obligations |  | $ | 100 |  | $ | 1 |  | $ | — |  | $ | 101 |
U.S. government securities funds |  | 1,791 |  | — |  | (15 | ) | 1,776 |
Equity securities |  | 227 |  | 454 |  | (12 | ) | 669 |
Total short-term investment securities |  | $ | 2,118 |  | $ | 455 |  | $ | (27 | ) | $ | 2,546 |
The municipal obligations held at a fair value of $100 at March 31, 2015, all mature in less than one year. During the three-month periods ended March 31, 2015, and 2014, the proceeds from the sales of available-for-sale securities were $0 and $33, respectively. The Company’s trading securities portfolio totaled $1,118 at March 31, 2015, and $1,038 at December 31, 2014, and generated gains of $23 and $15 for the three months ended March 31, 2015, and 2014. As of March 31, 2015, and December 31, 2014, the Company had unrealized losses of $8 and $15, 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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