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Note 8 - Marketable Securities | 12 Months Ended
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Dec. 31, 2018
Notes to Financial Statements |
Investment [Text Block] | Note 8 – Marketable Securities The Company invests in short-term and long-term agency, municipal, corporate and other debt securities. The securities are categorized as held-to-maturity and are recorded at amortized cost. Categorization as held-to-maturity is based on the Company’s ability and intent to hold these securities to maturity. Information regarding the Company’s short-term and long-term marketable securities as of December 31, 2018 and 2017 is as follows:
|  | 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 |
Fair values for the corporate debt securities are primarily determined based on quoted market prices (Level 1 ). Fair values for the U.S. municipal securities, U.S. government agency securities and certificates of deposit are primarily determined using dealer quotes or quoted market prices for similar securities (Level 2 ). The Company tests for other than temporary losses on a quarterly basis and has considered the unrealized losses indicated above to be temporary in nature. The investment policy adopted by the Company dictates that only investments in quality, highly rated debt securities are permitted. Those unrealized losses displayed above are the result of macroeconomic factors and are indicative of neither the quality of the underlying security nor the issuer’s ability to pay its debt. The Company intends, and has the ability, to hold the investments to maturity and recover the full principal. Classification of marketable securities as current or non-current is based upon the security’s maturity date as of the date of these financial statements. The December 31, 2018 balance of held-to-maturity debt securities by contractual maturity is shown in the following table at amortized cost. Actual maturities may differ from contractual maturities because the issuers of the securities may have the right to prepay obligations without prepayment penalties.
|  | 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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