Note 4 - Leases, Right-to-Use Assets and Related Liabilities - Lease Costs (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Operating lease cost	$ 1,554
Short-term lease cost	66
Variable lease expense (1)	119	[1]
Total lease cost	1,739
Operating cash flows from operating leases	1,554
Right-to-use assets obtained in exchange for new operating lease liabilities	$ 280
Weighted-average remaining lease term, operating leases (months) (Month)	1 year 270 days
Weighted-average discount rate - operating leases	12.00%

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