Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024
Restricted Cash and Cash Equivalent, Noncurrent	$ 129	$ 100	$ 129
Restricted Cash and Cash Equivalent, Current	1,372		$ 2,032
Accounts Receivable, Allowance for Credit Loss	0	100
Contract with Customer, Refund Liability	200	300
Letter of Credit [Member]
Restricted Cash and Cash Equivalent, Current	1,000	$ 1,000
Line of Credit [Member]
Restricted Cash and Cash Equivalent, Current	$ 400