Note 15 - Stock-based Compensation - Common Stock Reserved for Future Issuance (Details)	Dec. 31, 2021 shares
Convertible preferred stock – Series B and Series D (in shares)	63,747,077
Warrant [Member]
Convertible preferred stock – Series B and Series D (in shares)	3,150,000
Share-based Payment Arrangement, Option [Member]
Convertible preferred stock – Series B and Series D (in shares)	4,818,876
Restricted Stock Units (RSUs) [Member]
Convertible preferred stock – Series B and Series D (in shares)	81,019,401
Convertible Preferred Stock [Member]
Convertible preferred stock – Series B and Series D (in shares)	398,269,637