Note 8 - Leases (Details Textual) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Operating Lease, Expense	$ 0.6	$ 0.7	$ 1.3	$ 1.3
Operating Lease, Weighted Average Remaining Lease Term (Year)	15 years 2 months 12 days		15 years 2 months 12 days
Operating Lease, Weighted Average Discount Rate, Percent	3.60%		3.60%