Note 6 - Leases - Maturities of Lease Liabilities (Details) - USD ($)	Dec. 31, 2019	Jan. 01, 2019
2020, operating leases	$ 873,000
2020, financing leases	15,000
2021, operating leases	559,000
2021, financing leases	3,000
Total operating lease payments	1,432,000
Total financing lease payments	18,000
Less: operating lease interest	(78,000)
Less: financing lease interest	(1,000)
Total present value of operating lease liabilities	1,354,000	$ 1,800,000
Total present value of financing lease liabilities	$ 17,000