Note 10 - Commitments and Contingencies - Future Minimum Lease Commitments (Details) - USD ($)	Sep. 30, 2020	Jan. 01, 2019
2021, operating leases	$ 960,000
2021, financing leases	100,000
2022, operating leases	859,000
2022, financing leases	62,000
2023, operating leases	637,000
2023, financing leases	14,000
2024, operating leases	548,000
2024, financing leases	14,000
2025, operating leases	352,000
2025, financing leases	3,000
Thereafter, operating leases	269,000
Thereafter, financing leases
Operating leases	3,625,000
Financing leases	193,000
Impact of discounting, operating leases	(383,000)
Impact of discounting, financing leases	(57,000)
Discounted value of lease obligations, operating leases	3,242,000	$ 2,400,000
Discounted value of lease obligations, financing leases	$ 136,000