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Note 2 - Fair Value of Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2021
Notes Tables |
Cash and Cash Equivalents and Debt Securities, Available-for-sale, Amortized Cost to Fair Value [Table Text Block] |
|  | December 31, 2021 |
|  | Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |
|  | (in thousands) |
Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  | $ | 61,220 |  |  | $ | — |  |  | $ | — |  |  | $ | 61,220 |
Money market funds |  |  | 75,258 |  |  |  | — |  |  |  | — |  |  |  | 75,258 |
Commercial paper |  |  | 850 |  |  |  | — |  |  |  | — |  |  |  | 850 |
Total |  |  | 137,328 |  |  |  | — |  |  |  | — |  |  |  | 137,328 |
Short-term marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper |  |  | 28,869 |  |  |  | 101 |  |  |  | (7 | ) |  |  | 28,963 |
Corporate bonds |  |  | 3,952 |  |  |  | — |  |  |  | — |  |  |  | 3,952 |
Asset-backed securities |  |  | 217,160 |  |  |  | 2 |  |  |  | (163 | ) |  |  | 216,999 |
U.S. Treasury and government agencies |  |  | 18,046 |  |  |  | — |  |  |  | — |  |  |  | 18,046 |
Total |  |  | 268,027 |  |  |  | 103 |  |  |  | (170 | ) |  |  | 267,960 |
Long-term marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset-backed securities |  |  | 14,941 |  |  |  | 6 |  |  |  | (36 | ) |  |  | 14,911 |
U.S. Treasury and government agencies |  |  | 37,664 |  |  |  | — |  |  |  | (136 | ) |  |  | 37,528 |
Foreign government |  |  | 1,007 |  |  |  | 12 |  |  |  | — |  |  |  | 1,019 |
Corporate bonds |  |  | 57,762 |  |  |  | 160 |  |  |  | (182 | ) |  |  | 57,740 |
Total |  |  | 111,374 |  |  |  | 178 |  |  |  | (354 | ) |  |  | 111,198 |
Total |  | $ | 516,729 |  |  | $ | 281 |  |  | $ | (524 | ) |  | $ | 516,486 |
|  | December 31, 2020 |
|  | Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |
|  | (in thousands) |
Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  | $ | 33,105 |  |  | $ | — |  |  | $ | — |  |  | $ | 33,105 |
Money market funds |  |  | 38,028 |  |  |  | — |  |  |  | — |  |  |  | 38,028 |
Commercial paper |  |  | 2,999 |  |  |  | — |  |  |  | — |  |  |  | 2,999 |
Total |  |  | 74,132 |  |  |  | — |  |  |  | — |  |  |  | 74,132 |
Short-term marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper |  |  | 6,147 |  |  |  | — |  |  |  | — |  |  |  | 6,147 |
Corporate bonds |  |  | 24,368 |  |  |  | 170 |  |  |  | — |  |  |  | 24,538 |
Asset-backed securities |  |  | 6,263 |  |  |  | 18 |  |  |  | — |  |  |  | 6,281 |
U.S. Treasury and government agencies |  |  | 244,568 |  |  |  | 369 |  |  |  | (11 | ) |  |  | 244,926 |
Total |  |  | 281,346 |  |  |  | 557 |  |  |  | (11 | ) |  |  | 281,892 |
Long-term marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset-backed securities |  |  | 38,456 |  |  |  | 160 |  |  |  | (3 | ) |  |  | 38,613 |
U.S. Treasury and government agencies |  |  | 6,884 |  |  |  | 17 |  |  |  | — |  |  |  | 6,901 |
Foreign government |  |  | 1,006 |  |  |  | 31 |  |  |  | — |  |  |  | 1,037 |
Corporate bonds |  |  | 51,068 |  |  |  | 839 |  |  |  | — |  |  |  | 51,907 |
Total |  |  | 97,414 |  |  |  | 1,047 |  |  |  | (3 | ) |  |  | 98,458 |
Total |  | $ | 452,892 |  |  | $ | 1,604 |  |  | $ | (14 | ) |  | $ | 454,482 |
Fair Value, Assets Measured on Recurring Basis [Table Text Block] |
|  | December 31, 2021 |
|  | Level 1 |  |  | Level 2 |  |  | Fair Value |
|  | (in thousands) |
Money market funds |  | $ | 75,258 |  |  | $ | — |  |  | $ | 75,258 |
Commercial paper |  |  | — |  |  |  | 18,896 |  |  |  | 18,896 |
U.S. Treasury and government agencies |  |  | — |  |  |  | 254,527 |  |  |  | 254,527 |
Foreign government |  |  | — |  |  |  | 1,019 |  |  |  | 1,019 |
Corporate bonds |  |  | — |  |  |  | 86,703 |  |  |  | 86,703 |
Asset-backed securities |  |  | — |  |  |  | 18,863 |  |  |  | 18,863 |
Total |  | $ | 75,258 |  |  | $ | 380,008 |  |  | $ | 455,266 |
|  | December 31, 2020 |
|  | Level 1 |  |  | Level 2 |  |  | Fair Value |
|  | (in thousands) |
Money market funds |  | $ | 38,028 |  |  | $ | — |  |  | $ | 38,028 |
Commercial paper |  |  | — |  |  |  | 9,146 |  |  |  | 9,146 |
U.S. Treasury and government agencies |  |  | — |  |  |  | 251,827 |  |  |  | 251,827 |
Foreign government |  |  | — |  |  |  | 1,037 |  |  |  | 1,037 |
Corporate bonds |  |  | — |  |  |  | 76,445 |  |  |  | 76,445 |
Asset-backed securities |  |  | — |  |  |  | 44,894 |  |  |  | 44,894 |
Total |  | $ | 38,028 |  |  | $ | 383,349 |  |  | $ | 421,377 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | December 31, 2021 |
|  | Mature within One Year |  |  | Mature after One Year through Two Years |  |  | Mature over Two Years |  |  | Fair Value |
|  | (in thousands) |
Commercial paper |  | $ | 18,896 |  |  | $ | — |  |  | $ | — |  |  | $ | 18,896 |
U.S. Treasury and government agencies |  |  | 216,999 |  |  |  | 37,528 |  |  |  | — |  |  |  | 254,527 |
Foreign government |  |  | — |  |  |  | 1,019 |  |  |  | — |  |  |  | 1,019 |
Corporate bonds |  |  | 28,964 |  |  |  | 38,407 |  |  |  | 19,332 |  |  |  | 86,703 |
Asset-backed securities |  |  | 3,951 |  |  |  | 7,959 |  |  |  | 6,953 |  |  |  | 18,863 |
Total |  | $ | 268,810 |  |  | $ | 84,913 |  |  | $ | 26,285 |  |  | $ | 380,008 |
Schedule of Derivative Instruments [Table Text Block] |
|  | December 31, |
|  | 2021 |  |  | 2020 |
|  | (in thousands) |
Assets |  |  |  |  |  |  |  |
Foreign currency forward contracts designated as cash flow hedge |  | $ | 1,737 |  |  | $ | 511 |
Foreign currency forward contracts not designated as hedging instruments |  |  | 1,599 |  |  |  | 27 |
Total |  | $ | 3,336 |  |  | $ | 538 |
Liabilities |  |  |  |  |  |  |  |
Foreign currency forward contracts designated as cash flow hedge |  | $ | (181 | ) |  | $ | (2,200 | )
Foreign currency forward contracts not designated as hedging instruments |  |  | (207 | ) |  |  | (1,677 | )
Total |  | $ | (388 | ) |  | $ | (3,877 | )
Derivative Instruments, Gain (Loss) [Table Text Block] |
|  | Year Ended December 31, |
|  | 2021 |  |  | 2020 |  |  | 2019 |
|  | (in thousands) |
Net gains (losses) from non-designated forward contracts |  | $ | 2,452 |  |  | $ | (1,634 | ) |  | $ | 438 |
Other foreign currency transactions gains (losses) |  |  | (2,749 | ) |  |  | 1,894 |  |  |  | (792 | )
Total foreign exchange gains (losses), net |  |  | (297 | ) |  |  | 260 |  |  |  | (354 | )
Other expenses |  |  | (276 | ) |  |  | (253 | ) |  |  | (253 | )
Other income (expense), net |  | $ | (573 | ) |  | $ | 7 |  |  | $ | (607 | )

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