Note 6 - Fair Value Measurements - Summary of Financial Assets Measured at Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Fair Value, Inputs, Level 1 [Member] | Warrant Liability [Member]
Fair value of warrant liabilities	$ 0	$ 0
Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member]
Assets	17,998	20,023
Fair Value, Inputs, Level 1 [Member] | Restricted Cash [Member]
Assets	1,145	2,172
Fair Value, Inputs, Level 2 [Member] | Warrant Liability [Member]
Fair value of warrant liabilities	0	0
Fair Value, Inputs, Level 2 [Member] | Cash and Cash Equivalents [Member]
Assets	0	0
Fair Value, Inputs, Level 2 [Member] | Restricted Cash [Member]
Assets	0	0
Fair Value, Inputs, Level 3 [Member] | Warrant Liability [Member]
Fair value of warrant liabilities	109	1,033
Fair Value, Inputs, Level 3 [Member] | Cash and Cash Equivalents [Member]
Assets	0	0
Fair Value, Inputs, Level 3 [Member] | Restricted Cash [Member]
Assets	$ 0	$ 0