Note 10 - Operating Leases (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating Lease, Weighted Average Discount Rate, Percent	3.80%
Operating Lease, Weighted Average Remaining Lease Term (Year)	3 years 2 months 12 days
Operating Lease, Expense	$ 1.0	$ 1.1	$ 1.1