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Investments | 3 Months Ended
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Mar. 31, 2014
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, 2014 |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |
Municipal obligations |  | $ | 402 |  | $ | 8 |  | $ | — |  | $ | 410 |
U.S. government securities funds |  | 999 |  | — |  | (14 | ) | 985 |
Equity securities |  | 227 |  | 397 |  | (7 | ) | 617 |
Total short-term investment securities |  | $ | 1,628 |  | $ | 405 |  | $ | (21 | ) | $ | 2,012 |
As of December 31, 2013 |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |
Municipal obligations |  | $ | 403 |  | $ | 12 |  | $ | — |  | $ | 415 |
U.S. government securities funds |  | 997 |  | — |  | (14 | ) | 983 |
Equity securities |  | 227 |  | 386 |  | (5 | ) | 608 |
Total short-term investment securities |  | $ | 1,627 |  | $ | 398 |  | $ | (19 | ) | $ | 2,006 |
The municipal obligations held at a fair value of $410 at March 31, 2014, all mature in less than two years. During the three-month periods ended March 31, 2014 and 2013, the proceeds from the sales of available-for-sale securities were $33 and $0, 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, 2014 and 2013, respectively. The Company’s trading securities portfolio totaled $1,004 at March 31, 2014, and $971 at December 31, 2013, and generated gains of $15 and $45 for the three months ended March 31, 2014 and 2013. As of March 31, 2014 and December 31, 2013, the Company had unrealized losses of $14 and $14, 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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