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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

The minimum LIBOR interest that will be added to the basis spread.

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Face (par) amount of debt instrument at time of issuance.

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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.

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Amount of cash outflow for cost from early extinguishment and prepayment of debt. Includes, but is not limited to, third-party cost, premium paid, and other fee paid to lender directly for debt extinguishment or debt prepayment. Excludes accrued interest.

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