Note 8 - Leases - Maturities of Lease Liabilities (Details) - USD ($)	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Finance lease, remainder	$ 88,000
Operating lease, remainder	787,000
Total, remainder	875,000
Finance lease, 2020	117,000
Operating lease, 2020	862,000
Total, 2020	979,000
Finance lease, 2021	118,000
Operating lease, 2021	838,000
Total, 2021	956,000
Finance lease, 2022	112,000
Operating lease, 2022	827,000
Total, 2022	939,000
Finance lease, 2023	38,000
Operating lease, 2023	834,000
Total, 2023	872,000
Finance lease, thereafter
Operating lease, thereafter	9,923,000
Total, thereafter	9,923,000
Finance lease, total undiscounted future minimum lease cash payments	473,000
Operating lease, total undiscounted future minimum lease cash payments	14,071,000
Total undiscounted future minimum lease cash payments	14,544,000
Finance lease, present value discount	(20,000)
Operating lease, present value discount	(4,581,000)
Total present value discount	(4,601,000)
Finance Lease, Liability, Total	453,485
Operating Lease, Liability, Total	9,490,385	$ 10,100,000
Total, lease liability	$ 9,943,000