Note 5 - Leases - Lease Term and Discount Rate (Details)	Dec. 31, 2021	Dec. 31, 2020
Weighted average discount rate - operating leases	3.80%	3.30%
Weighted average discount rate - finance leases	6.10%	5.70%
Weighted average remaining lease term in years - operating leases (Year)	7 years 9 months 18 days	9 years 4 months 24 days
Weighted average remaining lease term in years - finance leases (Year)	3 years	2 years 7 months 6 days