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Note 9 - Fair Value Measurement (Tables) | 9 Months Ended
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Sep. 30, 2021
Notes Tables |
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] |
|  | Fair Value Measurement at Reporting Date Using |
September 30, 2021 |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Cash equivalents |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 61,231 |  |  | $ | — |  |  | $ | — |  |  | $ | 61,231 |
Other noncurrent assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash |  |  | 1,512 |  |  |  | — |  |  |  | — |  |  |  | 1,512 |
Total assets |  | $ | 62,743 |  |  | $ | — |  |  | $ | — |  |  | $ | 62,743 |
Accrued and other current liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swap |  | $ | — |  |  | $ | 5,001 |  |  | $ | — |  |  | $ | 5,001 |
Total liabilities |  | $ | — |  |  | $ | 5,001 |  |  | $ | — |  |  | $ | 5,001 |
December 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 70,483 |  |  | $ | — |  |  | $ | — |  |  | $ | 70,483 |
Other noncurrent assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash |  |  | 1,512 |  |  |  | — |  |  |  | — |  |  |  | 1,512 |
Total assets |  | $ | 71,995 |  |  | $ | — |  |  | $ | — |  |  | $ | 71,995 |
Accrued and other current liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swap |  | $ | — |  |  | $ | 7,606 |  |  | $ | — |  |  | $ | 7,606 |
Total liabilities |  | $ | — |  |  | $ | 7,606 |  |  | $ | — |  |  | $ | 7,606 |
September 30, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 78,981 |  |  | $ | — |  |  | $ | — |  |  | $ | 78,981 |
Other noncurrent assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash |  |  | 1,512 |  |  |  | — |  |  |  | — |  |  |  | 1,512 |
Total assets |  | $ | 80,493 |  |  | $ | — |  |  | $ | — |  |  | $ | 80,493 |
Accrued and other current liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swap |  | $ | — |  |  | $ | 8,353 |  |  | $ | — |  |  | $ | 8,353 |
Total liabilities |  | $ | — |  |  | $ | 8,353 |  |  | $ | — |  |  | $ | 8,353 |
Fair Value, by Balance Sheet Grouping [Table Text Block] |
|  |  | September 30, 2021 |  |  | December 31, 2020 |  |  | September 30, 2020 |
(in thousands) | Fair Value Hierarchy |  | Carrying Value |  |  | Fair Value |  |  | Carrying Value |  |  | Fair Value |  |  | Carrying Value |  |  | Fair Value |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Held-to-maturity marketable securities (1) | Level 1 |  | $ | 10,600 |  |  | $ | 10,582 |  |  | $ | 5,200 |  |  | $ | 5,200 |  |  | $ | 5,700 |  |  | $ | 5,696 |
Liabilities (including current maturities): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2.75% Convertible Notes (2),(3) | Level 2 |  | $ | 205,543 |  |  | $ | 326,025 |  |  | $ | 200,303 |  |  | $ | 248,400 |  |  | $ | 198,606 |  |  | $ | 184,000 |
Credit Agreement - term loan (2) | Level 3 |  |  | 125,625 |  |  |  | 126,610 |  |  |  | 131,250 |  |  |  | 133,030 |  |  |  | 133,125 |  |  |  | 135,046 |
Credit Agreement - revolving credit facility (2) | Level 3 |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 75,000 |  |  |  | 76,180 |

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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