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MARKETABLE SECURITIES | 12 Months Ended
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Dec. 31, 2019
Marketable Securities [Abstract] |
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] | MARKETABLE SECURITIES: Amortized cost and estimated fair market value of marketable securities classified as available-for-sale (excluding cash equivalents) at December 31, 2019, were as follows:
| Amortized |  | Gross Unrealized |  | Estimated Fair
(in thousands) | Cost |  | Gains |  | Losses |  | Market Value
Investments due in 3 months or less: |  |  |  |  |  |  |
Corporate securities | $ | 15,934 |  |  | $ | 18 |  |  | $ | — |  |  | $ | 15,952 |
Total | 15,934 |  |  | 18 |  |  | — |  |  | 15,952 |
Investments due in 4-12 months: |  |  |  |  |  |  |
Corporate securities | 71,223 |  |  | 269 |  |  | — |  |  | 71,492 |
Total | 71,223 |  |  | 269 |  |  | — |  |  | 71,492 |
Investments due in 12 months or greater: |  |  |  |  |  |  |
Corporate securities | 144,658 |  |  | 302 |  |  | (6 | ) |  | 144,954 |
Total | 144,658 |  |  | 302 |  |  | (6 | ) |  | 144,954 |
Total marketable securities | $ | 231,815 |  |  | $ | 589 |  |  | $ | (6 | ) |  | $ | 232,398 |
Amortized cost and estimated fair market value of marketable securities classified as available-for-sale (excluding cash equivalents) at December 31, 2018, were as follows:
| Amortized |  | Gross Unrealized |  | Estimated Fair
(in thousands) | Cost |  | Gains |  | Losses |  | Market Value
Investments due in 3 months or less: |  |  |  |  |  |  |
Corporate securities | $ | 6,788 |  |  | $ | — |  |  | $ | (2 | ) |  | $ | 6,786 |
Total | 6,788 |  |  | — |  |  | (2 | ) |  | 6,786 |
Investments due in 4-12 months: |  |  |  |  |  |  |
Corporate securities | 60,123 |  |  | — |  |  | (244 | ) |  | 59,879 |
Total | 60,123 |  |  | — |  |  | (244 | ) |  | 59,879 |
Investments due in 12 months or greater: |  |  |  |  |  |  |
Corporate securities | 27,806 |  |  | 2 |  |  | (22 | ) |  | 27,786 |
Total | 27,806 |  |  | 2 |  |  | (22 | ) |  | 27,786 |
Total marketable securities | $ | 94,717 |  |  | $ | 2 |  |  | $ | (268 | ) |  | $ | 94,451 |
The weighted average interest rate of investments at December 31, 2019 and 2018, was approximately 2.17% and 2.65%, respectively. As of December 31, 2019 and 2018, there were no individual securities that had been in a continuous loss position for 12 months or greater.

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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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