Note 5 - Leases - Maturity of Lease Liabilities (Details) - USD ($)	Sep. 30, 2019	Jan. 01, 2019
Operating leases, remaining 2019	$ 191,000
Finance leases, remaining 2019	133,000
Total, remaining 2019	324,000
Operating leases, 2020	858,000
Finance leases, 2020	534,000
Total, 2020	1,392,000
Operating leases, 2021	722,000
Finance leases, 2021	534,000
Total, 2021	1,256,000
Operating leases, 2022	726,000
Finance leases, 2022	359,000
Total, 2022	1,085,000
Operating leases, 2023	738,000
Finance leases, 2023	138,000
Total, 2023	876,000
Operating leases, thereafter	3,381,000
Finance leases, thereafter	102,000
Total, thereafter	3,483,000
Operating leases, total lease payments	6,616,000
Finance leases, total lease payments	1,800,000
Total, total lease payments	8,416,000
Operating leases, less: Interest	(1,258,000)
Finance leases, less: Interest	(156,000)
Total, less: Interest	(1,414,000)
Operating leases, present value of lease liabilities	5,358,000	$ 5,731,000
Finance leases, present value of lease liabilities	1,644,000
Total, present value of lease liabilities	$ 7,002,000