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Note 12 - Convertible Senior Notes (Tables)

3 Months Ended

Mar. 31, 2024

Notes Tables

Convertible Debt [Table Text Block]

		March 31,				December 31,
​		2024				2023
Principal		$	80,214			$	80,214
Unamortized debt issuance costs			(3,883	)			(3,981	)
Net carrying amount		$	76,331			$	76,233

Interest Income and Interest Expense Disclosure [Table Text Block]

		Three months ended March 31,
​		2024				2023
Contractual interest expense		$	1,059				1,006
Amortization of debt issuance costs			350				204
Total interest cost		$	1,408				1,210
Effective interest rate			5.3	%			5.1	%

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