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Note 8 - Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2018
Notes Tables |
Debt Securities, Held-to-maturity [Table Text Block] |
|  | December 31, 2018 |
(in thousands) |  | Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |
U.S. government agency securities |  | $ | 16,843 |  |  | $ | - |  |  | $ | (88 | ) |  | $ | 16,755 |
Corporate debt securities |  |  | 31,769 |  |  |  | - |  |  |  | (96 | ) |  |  | 31,673 |
U.S. municipal securities |  |  | 17,509 |  |  |  | 1 |  |  |  | (33 | ) |  |  | 17,477 |
Certificates of deposit/time deposits |  |  | 4,208 |  |  |  | - |  |  |  | (25 | ) |  |  | 4,183 |
Total marketable securities |  | $ | 70,329 |  |  | $ | 1 |  |  | $ | (242 | ) |  | $ | 70,088 |
|  | December 31, 2017 |
(in thousands) |  | Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |
U.S. government agency securities |  | $ | 32,320 |  |  | $ | - |  |  | $ | (199 | ) |  | $ | 32,121 |
Corporate debt securities |  |  | 29,806 |  |  |  | - |  |  |  | (128 | ) |  |  | 29,678 |
U.S. municipal securities |  |  | 28,364 |  |  |  | - |  |  |  | (104 | ) |  |  | 28,260 |
Certificates of deposit/time deposits |  |  | 3,968 |  |  |  | - |  |  |  | (32 | ) |  |  | 3,936 |
Total marketable securities |  | $ | 94,458 |  |  | $ | - |  |  | $ | (463 | ) |  | $ | 93,995 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | December 31, |
(in thousands) |  | 2018 |
Due in one year or less |  | $ | 46,750 |
Due after one year through five years |  |  | 23,579 |
Total marketable securities |  | $ | 70,329 |

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- Definition Tabular disclosure of information about investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 + Details
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