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Note 12 - Convertible Senior Notes (Tables)

6 Months Ended

Jun. 30, 2022

Notes Tables

Convertible Debt [Table Text Block]

		*June 30,*				*December 31,*
		*2022*				*2021*
Principal		$	80,500			$	80,500
Unamortized debt issuance costs			(1,410	)			(1,820	)
Net carrying amount		$	79,090			$	78,680

Interest Income and Interest Expense Disclosure [Table Text Block]

		*Three months ended June 30,*								*Six months ended June 30,*
		*2022*				*2021*				*2022*				*2021*
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	%