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Note 12 - Convertible Senior Notes - Schedule of Interest Expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Amortization of debt issuance costs $ 306 $ 211
The 5% Convertible Senior Notes Due 2024 [Member]    
Contractual interest expense 1,006 1,006
Amortization of debt issuance costs 204 204
Total interest cost $ 1,210 $ 1,210
Effective interest rate 5.10% 5.10%