Note 6 - Long-term Debt - Carrying Amount of the Company's Outstanding Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Other loans	$ 171	$ 152
Debt discount and debt issuance costs, net of accumulated accretion	(3,587)	(366)
Total outstanding long-term debt	46,584	78,647
Less current portion	107	51
Total outstanding debt	46,477	78,596
Convertible Senior Notes Due July 2, 2024 [Member]
Convertible debt	50,000	0
Convertible Senior Notes Due March 25, 2021 [Member]
Convertible debt	$ 0	$ 78,861

Including the current and noncurrent portions, carrying amount of debt identified as being convertible into another form of financial instrument (typically the entity's common stock) as of the balance sheet date, which originally required full repayment more than twelve months after issuance or greater than the normal operating cycle of the company.

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