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Note 4 - Senior Credit Facility (Details Textual) - USD ($) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Feb. 05, 2019 | Dec. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Interest Expense, Debt, Total |  |  | $ 14,115 | $ 2,927 | $ 40,514 | $ 8,892
MidCap Financial Services, LLC [Member] | Senior Credit Facility [Member] |  |  |  |  |  |
Debt Instrument, Face Amount | $ 100,000 |  |  |  |  |
Debt Instrument, Minimum LIBOR | 0.50% |  |  |  |  |
Debt Instrument, Term (Month) | 30 months |  |  |  |  |
Interest Expense, Debt, Total |  |  |  |  |  | $ 4,064
Extinguishment of Debt, Amount |  | $ 40,000 |  |  |  |
Payment for Debt Extinguishment or Debt Prepayment Cost |  | 3,298 |  |  |  |
Write off of Deferred Debt Issuance Cost |  | $ 1,211 |  |  |  |
MidCap Financial Services, LLC [Member] | Senior Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 8.00% |  |  |  |  |
MidCap Financial Services, LLC [Member] | Senior Credit Facility [Member] | Secured Credit Facility, First Tranche [Member] |  |  |  |  |  |
Debt Instrument, Face Amount | $ 50,000 |  |  |  |  |
Repayments of Long-term Debt, Total | 30,000 |  |  |  |  |
MidCap Financial Services, LLC [Member] | Senior Credit Facility [Member] | Secured Credit Facility, Second Tranche [Member] |  |  |  |  |  |
Debt Instrument, Face Amount | 30,000 |  |  |  |  |
MidCap Financial Services, LLC [Member] | Senior Credit Facility [Member] | Secured Credit Facility, Third Tranche [Member] |  |  |  |  |  |
Debt Instrument, Face Amount | $ 20,000 |  |  |  |  |

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28551-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124429444&loc=SL124452920-239629 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69C -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495737-112612 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69B -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495735-112612 + Details
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