Note 4 - Leases, Right-to-use Assets and Related Liabilities - Lease Costs (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Financing lease cost		$ 11	$ 1
Operating lease cost		61	471
Short-Term lease cost		132	80
Variable lease cost (1)	[1]	39	32
Total lease cost		243	584
Operating cash flows from finance lease		6	1
Operating cash flows from operating leases		61	471
Finance cash flows from finance lease		7
Right-of-use asset purchased with operating lease		$ 1,562
Weighted-average remaining lease term, financing lease (months) (Month)		18 years 150 days	4 years 330 days
Weighted-average remaining lease term, operating leases (months) (Month)		7 years 300 days	1 year 180 days
Weighted-average discount rate - financing lease (2)	[2]	13.00%	21.00%
Weighted-average discount rate - operating leases (3)	[3]	5.00%	12.00%

[1] Represents amounts incurred in excess of minimum payments for common area maintenance and present value discounts.

[2] The discount rate used for the finance lease was based on the rate implicit in the lease.

[3] The discount rate used for operating leases is based on our implicit borrowing rate at the date the Company entered into the lease.