Note 9 - Leases - Weighted Average Lease Term and Discount Rates (Details)	Sep. 30, 2021	Dec. 31, 2020
Finance leases (Year)	7 months 6 days	9 months 18 days
Operating leases (Year)	3 years 3 months 18 days	3 years 9 months 18 days
Finance leases	5.56%	5.56%
Operating leases	5.01%	5.06%