Note 10 - Leases (Details Textual) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Buildings and Equipment [Member]
Operating Lease, Right-of-Use Asset	$ 558,000	$ 602,000
Minimum [Member]
Lessee, Operating Lease, Remaining Lease Term (Year)	1 year
Maximum [Member]
Lessee, Operating Lease, Remaining Lease Term (Year)	5 years