Note 5 - Long-term Debt (Details Textual) - USD ($) |
3 Months Ended | |||
|---|---|---|---|---|
Mar. 31, 2023 |
Mar. 31, 2022 |
Dec. 31, 2022 |
May 30, 2019 |
|
| Amortization of Debt Discount (Premium) | $ 38,000 | $ 134,000 | ||
| Loan Agreement with Oxford Finance LLC [Member] | ||||
| Debt Instrument, Face Amount | $ 25,000,000.0 | |||
| Long-Term Debt | 3,300,000 | $ 5,400,000 | ||
| Interest Expense, Debt | 100,000 | 400,000 | ||
| Amortization of Debt Discount (Premium) | $ 39,000 | $ 100,000 | ||
| X | ||||||||||
- Definition Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Face (par) amount of debt instrument at time of issuance. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of the cost of borrowed funds accounted for as interest expense for debt. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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| X | ||||||||||
- Definition Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Details
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