Note 6 - Operating Leases (Details Textual)	Sep. 30, 2020 Rate
Operating Lease, Provided, Rental Escalations (Rate)	2.10%
Minimum [Member]
Lessee, Operating Lease, Term of Contract (Year)	5 years 91 days
Maximum [Member]
Lessee, Operating Lease, Term of Contract (Year)	5 years 120 days