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Note 3 - Fair Value Measurements - Financial Instruments Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Warrant liability	$ 8,772	$ 0
Fair Value, Recurring [Member] \| Warrant [Member]
Warrant liability	8,772
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Warrant [Member]
Warrant liability	0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Warrant [Member]
Warrant liability	0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Warrant [Member]
Warrant liability	8,772
Fair Value, Recurring [Member] \| Money Market Funds [Member]
Money market funds	49,223	49,217
Fair Value, Recurring [Member] \| Money Market Funds [Member] \| Fair Value, Inputs, Level 1 [Member]
Money market funds	49,223	49,217
Fair Value, Recurring [Member] \| Money Market Funds [Member] \| Fair Value, Inputs, Level 2 [Member]
Money market funds	0	0
Fair Value, Recurring [Member] \| Money Market Funds [Member] \| Fair Value, Inputs, Level 3 [Member]
Money market funds	$ 0	$ 0