Note 13 - Leases (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Operating Lease, Weighted Average Remaining Lease Term (Year)	3 years 6 months 25 days
Operating Lease, Weighted Average Discount Rate, Percent	5.84%
Operating Lease, Payments	$ 0.8	$ 1.0
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	0.3
Finance Lease, Liability, to be Paid, Total	0.5
General and Administrative Expense [Member]
Operating Lease, Cost	0.8	1.0
Variable Lease, Cost	$ 0.2	$ 0.1