Note 9 - Leases - Undiscounted Payments Under Non-cancelable Leases (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Finance leases, remainder 2020	$ 188	$ 257
Operating leases, remainder 2020	410	591
Finance leases, 2021	251	251
Operating leases, 2021	449	453
Finance leases, 2022	204	204
Operating leases, 2022	222	226
Finance leases, 2023	123	123
Operating leases, 2023	242	246
Finance leases, 2024	13	13
Operating leases, 2024	203	203
Finance leases, thereafter
Operating leases, thereafter	117	118
Finance leases, total minimum lease payments	779	848
Operating leases, total minimum lease payments	1,643	1,837
Finance leases, less: Amount representing interest	(53)	(62)
Operating leases, less: Amount representing interest	(153)	(174)
Present value of minimum finance lease payments	726	786
Current portion, finance leases	(224)	(227)
Current portion, operating leases	(476)	(524)
Finance leases obligations, net of current portion	502	559
Other Current Liabilities and Other Noncurrent Liabilities [Member]
Present value of minimum operating lease payments	1,490	1,663	[1]
Other Noncurrent Liabilities [Member]
Operating lease obligations, net of current portion	$ 1,014	$ 1,139	[1]

[1] Represents the December 31, 2018 balance recorded at implementation of Topic 842