Note 12 - Commitments and Contingencies - Future Minimum Lease Commitments (Details) - USD ($)	Dec. 31, 2019	Jan. 01, 2019
2020, operating leases	$ 1,011,000
2020, financing leases	259,000
2021, operating leases	964,000
2021, financing leases	232,000
2022, operating leases	774,000
2022, financing leases	75,000
2023, operating leases	641,000
2023, financing leases
2024, operating leases	473,000
2024, financing leases
Thereafter, operating leases	534,000
Thereafter, financing leases
Operating leases	4,397,000
Financing leases	566,000
Impact of discounting, operating leases	(16,000)
Impact of discounting, financing leases	(100,000)
Discounted value of lease obligations, operating leases	4,381,000	$ 2,400,000
Discounted value of lease obligations, financing leases	$ 466,000