Note 13 - Leases - Weighted Average Remaining Terms and Discount Rates (Details)	Dec. 31, 2020	Dec. 31, 2019
Weighted Average Remaining Lease Term - operating leases (years) (Year)	4 years 4 months 24 days	4 years 9 months 18 days
Weighted Average Remaining Lease Term - finance leases (years) (Year)	2 years 6 months
Weighted Average Discount Rate - operating leases	2.60%	2.60%
Weighted Average Discount Rate - finance leases	0.50%	0.00%