Note 8 - Leases (Details Textual) $ in Millions	3 Months Ended
	Mar. 31, 2022 USD ($)
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	$ 1.0
Operating Lease, Weighted Average Remaining Lease Term (Year)	5 years 1 month 6 days
Operating Lease, Weighted Average Discount Rate, Percent	4.80%
Operating Lease, Liability, Current	$ 3.6
Operating Lease, Expense	$ 1.5