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Marketable Securities | 12 Months Ended
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Dec. 31, 2020
Marketable Securities |
Marketable Securities | 2. Marketable Securities The Company has classified its marketable securities as available-for-sale securities. These securities are carried at estimated fair value with unrealized holding gains and losses included in accumulated other comprehensive income (loss) in shareholders’ equity until realized. Gains and losses on marketable security transactions are reported on the specific-identification method. Dividend and interest income are recognized when earned. The amortized cost, gross unrealized holding gains, gross unrealized holding losses, and fair value for available-for-sale securities by major security type and class of security at December 31, 2020 and 2019 were as follows:
|  | Amortized cost |  |  | Gross unrealized holding gains |  |  | Gross unrealized holding losses |  |  | Estimated fair value |
December 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds and notes |  | $ | 1,312 |  |  |  | 26 |  |  |  | — |  |  |  | 1,338 |
Municipal bonds |  |  | 1,536 |  |  |  | 5 |  |  |  | — |  |  |  | 1,541 |
Total available-for-sale securities |  | $ | 2,848 |  |  |  | 31 |  |  |  | — |  |  |  | 2,879 |
December 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds and notes |  | $ | 1,814 |  |  | $ | 21 |  |  | $ | (3 | ) |  | $ | 1,832 |
Municipal bonds |  |  | 2,707 |  |  |  | 5 |  |  |  | (1 | ) |  |  | 2,711 |
Total available-for-sale securities |  | $ | 4,521 |  |  | $ | 26 |  |  | $ | (4 | ) |  | $ | 4,543 |
Maturities of marketable securities classified as available-for-sale securities were as follows at December 31, 2020:
|  | Amortized |  |  | Estimated |
|  | cost |  |  | fair value |
Due within one year |  | $ | 1,106 |  |  |  | 1,117 |
Due after one year through five years |  |  | 1,742 |  |  |  | 1,762 |
Total available-for-sale securities |  | $ | 2,848 |  |  |  | 2,879 |
There were no debt securities in an unrealized loss position as of December 31, 2020.

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 + Details
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