Note 8 - Leases (Details Textual) $ in Thousands			3 Months Ended			9 Months Ended	12 Months Ended
	May 12, 2023 USD ($) ft²	Jun. 30, 2022 USD ($) ft²	Sep. 30, 2024 USD ($) ft²	Mar. 31, 2024 USD ($) ft²	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) ft²	Dec. 31, 2023 USD ($)
Lessee, Lease, Description [Line Items]
Lease, Cost, Total			$ 84		$ 171
Variable Lease, Cost			$ 53		$ 49
Office Space Lease Agreement [Member] | FLORIDA
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Renewal Term (Year)			12 months			12 months
Area of Land | ft²			1,533			1,533
Office Space Lease Agreement [Member] | NEW YORK
Lessee, Lease, Description [Line Items]
Area of Land | ft²	18,700			13,500
Office Space Lease Agreement [Member] | General and Administrative Expense [Member] | NEW YORK
Lessee, Lease, Description [Line Items]
Gain (loss) on termination of lease	$ (20)			$ (454)
Office Space Sublease Agreement [Member] | FLORIDA
Lessee, Lease, Description [Line Items]
Area of Land | ft²		31,000
Office Space Sublease Agreement [Member] | General and Administrative Expense [Member]
Lessee, Lease, Description [Line Items]
Impairment loss						$ 284
Office Space Sublease Agreement [Member] | General and Administrative Expense [Member] | FLORIDA
Lessee, Lease, Description [Line Items]
Impairment loss		$ 373					$ 488
Minimum [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract (Year)			1 year			1 year
Lessee, Operating Lease, Renewal Term (Year)			2 years			2 years
Maximum [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract (Year)			7 years			7 years
Lessee, Operating Lease, Renewal Term (Year)			5 years			5 years