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Note 12 - Convertible Senior Notes (Tables) | 6 Months Ended
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Jun. 30, 2023
Notes Tables |
Convertible Debt [Table Text Block] |
|  | June 30, |  |  | December 31, |
​ |  | 2023 |  |  | 2022 |
Principal |  | $ | 80,500 |  |  | $ | 80,500 |
Unamortized debt issuance costs |  |  | (584 | ) |  |  | (994 | )
Net carrying amount |  | $ | 79,916 |  |  | $ | 79,506 |
Interest Income and Interest Expense Disclosure [Table Text Block] |
|  | Three months ended June 30, |  |  | Six months ended June 30, |
​ |  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Contractual interest expense |  | $ | 1,006 |  |  | $ | 1,006 |  |  | $ | 2,013 |  |  | $ | 2,013 |
Amortization of debt issuance costs |  |  | 206 |  |  |  | 206 |  |  |  | 410 |  |  |  | 410 |
Total interest cost |  | $ | 1,212 |  |  | $ | 1,212 |  |  | $ | 2,423 |  |  | $ | 2,423 |
Effective interest rate |  |  | 5.1 | % |  |  | 5.1 | % |  |  | 5.1 | % |  |  | 5.1 | %

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- Definition Tabular disclosure of convertible debt instrument. Includes, but is not limited to, principal amount and amortized premium or discount. + References No definition available. + Details
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- Definition Tabular disclosure of interest income and expense, including, but not limited to, interest income and expense from investments, loans, and securities. + References No definition available. + Details
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- References No definition available. + Details
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