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Note 6 - Marketable Securities | 9 Months Ended
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Sep. 30, 2019
Notes to Financial Statements |
Investment [Text Block] | Note 6 – 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. The following table summarizes information regarding the Company’s short-term and long-term marketable securities as of September 30, 2019 and December 31, 2018:
|  | September 30, 2019 |
(in thousands) |  | Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |
U.S. municipal securities |  | $ | 5,612 |  |  | $ | 11 |  |  | $ | (3 | ) |  | $ | 5,620 |
Corporate debt securities |  |  | 16,503 |  |  |  | 100 |  |  |  | (1 | ) |  |  | 16,602 |
U.S. government agency securities |  |  | 8,340 |  |  |  | 1 |  |  |  | (10 | ) |  |  | 8,331 |
Certificates of deposit/time deposits |  |  | 1,479 |  |  |  | 22 |  |  |  | (1 | ) |  |  | 1,500 |
Commercial paper |  |  | 1,491 |  |  |  | - |  |  |  | (1 | ) |  |  | 1,490 |
Total marketable securities |  | $ | 33,425 |  |  | $ | 134 |  |  | $ | (16 | ) |  | $ | 33,543 |
|  | December 31, 2018 |
(in thousands) |  | Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |
U.S. municipal securities |  | $ | 17,509 |  |  | $ | 1 |  |  | $ | (33 | ) |  | $ | 17,477 |
Corporate debt securities |  |  | 31,769 |  |  |  | - |  |  |  | (96 | ) |  |  | 31,673 |
U.S. government agency securities |  |  | 16,843 |  |  |  | - |  |  |  | (88 | ) |  |  | 16,755 |
Certificates of deposit/time deposits |  |  | 4,208 |  |  |  | - |  |  |  | (25 | ) |  |  | 4,183 |
Total marketable securities |  | $ | 70,329 |  |  | $ | 1 |  |  | $ | (242 | ) |  | $ | 70,088 |
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, certificates of deposit and U.S. treasury securities 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. In reaching this conclusion, the Company considered the credit quality of the issuers of the debt securities as well as the Company’s intent 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 September 30, 2019 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.
|  | September 30, |
(in thousands) |  | 2019 |
Due in one year or less |  | $ | 23,642 |
Due after one year through five years |  |  | 9,783 |
Total marketable securities |  | $ | 33,425 |

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