Note 10 - Leases (Details Textual) - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Buildings and Equipment [Member]
Operating Lease, Right-of-Use Asset	$ 471,000	$ 602,000
Minimum [Member]
Lessee, Operating Lease, Remaining Lease Term (Year)	2 years
Maximum [Member]
Lessee, Operating Lease, Remaining Lease Term (Year)	3 years