Note 10 - Leases - Undiscounted Payments Under Non-cancelable Leases (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Jan. 01, 2019		Dec. 31, 2018
Finance leases, 2020	$ 257
Operating leases, 2020	591
Finance leases, 2021	251
Operating leases, 2021	453
Finance leases, 2022	204
Operating leases, 2022	226
Finance leases, 2023	123
Operating leases, 2023	246
Finance leases, 2024	13
Operating leases, 2024	203
Finance leases, thereafter
Operating leases, thereafter	118
Finance leases, total minimum lease payments	848
Operating leases, total minimum lease payments	1,837
Finance leases, less: Amount representing interest	(62)
Operating leases, less: Amount representing interest	(174)
Present value of minimum finance lease payments	786
Current portion, finance leases	(227)			$ (204)
Finance leases obligations, net of current portion	559			$ 676
Other Current Liabilities and Other Noncurrent Liabilities [Member]
Operating Lease, Liability, Total	1,663	$ 2,331
Other Current Liabilities [Member]
Current portion, operating leases	(524)	(692)	[1]
Other Noncurrent Liabilities [Member]
Operating lease obligations, net of current portion	$ 1,139	$ 1,639	[1]

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