Note 12 - Convertible Senior Notes (Tables)

9 Months Ended

Sep. 30, 2022

Notes Tables

Convertible Debt [Table Text Block]

		*September 30,*				*December 31,*
		*2022*				*2021*
Principal		$	80,500			$	80,500
Unamortized debt issuance costs			(1,202	)			(1,820	)
Net carrying amount		$	79,298			$	78,680

Interest Income and Interest Expense Disclosure [Table Text Block]

		*Three months ended September 30,*								*Nine months ended September 30,*
		*2022*				*2021*				*2022*				*2021*
Contractual interest expense		$	1,006			$	1,006			$	3,019			$	3,018
Amortization of debt issuance costs			208				208				618				618
Total interest cost		$	1,214			$	1,214			$	3,637			$	3,636
Effective interest rate			5.1	%			5.1	%			5.1	%			5.1	%