Note 13 - Fair Value Measurement - Fair Value of Liabilities on Recurring Basis (Details) - Fair Value, Recurring [Member] - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Derivative warrant liability	$ 69	$ 258
Total liabilities at fair value	69	258
Fair Value, Inputs, Level 1 [Member]
Derivative warrant liability	0	0
Total liabilities at fair value	0	0
Fair Value, Inputs, Level 2 [Member]
Derivative warrant liability	0	0
Total liabilities at fair value	0	0
Fair Value, Inputs, Level 3 [Member]
Derivative warrant liability	69	258
Total liabilities at fair value	$ 69	$ 258