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Note 8 - Indebtedness - Carrying Amount of the Notes (Details) - The Notes [Member] - Senior Notes [Member] - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022
Principal outstanding	$ 172,500	$ 172,500	$ 172,500
Unamortized debt issuance costs	(2,228)		(3,135)
Net carrying value	$ 170,272		$ 169,365

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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