Note 8 - Commitments and Contingencies (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Commitments and Contingencies [Line Items]
Weighted average remaining lease term	14 years 6 months
Weighted average discount rate	6.50%
Rent expense relating to operating leases, including straight-line rent	$ 400	$ 500
Annual percentage of changes in rent	3.00%
Deferred rent outstanding	$ 3,090	2,397
Outstanding commitments
Minimum [Member]
Commitments and Contingencies [Line Items]
Office leases initial terms	2 years
Maximum [Member]
Commitments and Contingencies [Line Items]
Office leases initial terms	51 years