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Note 4 - Senior Credit Facility (Details Textual) - USD ($) $ in Thousands |  | 1 Months Ended | 3 Months Ended
--- | --- | --- | ---
Feb. 05, 2019 | Dec. 31, 2020 | Mar. 31, 2021 | Mar. 31, 2020
Interest Expense, Debt, Total |  |  | $ 12,904 | $ 3,047
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 |  |  |  | $ 1,454
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 Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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