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Note 5 - Senior Credit Facility (Details Textual) - MidCap Financial Services, LLC [Member] - Senior Credit Facility [Member] - USD ($) $ in Thousands |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 05, 2019 | Dec. 31, 2020 | Dec. 31, 2020
Debt Instrument, Face Amount | $ 100,000 |  |
Debt Instrument, Minimum LIBOR | 0.50% |  |
Debt Instrument, Term (Month) | 30 months |  |
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 | $ 1,211
London Interbank Offered Rate (LIBOR) [Member] |  |  |
Debt Instrument, Basis Spread on Variable Rate | 8.00% |  |
Secured Credit Facility, First Tranche [Member] |  |  |
Debt Instrument, Face Amount | $ 50,000 |  |
Repayments of Long-term Debt, Total | 30,000 |  |
Secured Credit Facility, Second Tranche [Member] |  |  |
Debt Instrument, Face Amount | 30,000 |  |
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. + References No definition available. + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: 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=119993939&loc=d3e28551-108399 Reference 2: 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 + Details
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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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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585 + Details
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