Note 8 - Leases - Lease Cost and Other Lease Information (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)
Operating lease cost	$ 370	$ 730
Short-term lease cost	70	108
Variable lease cost	1	59
Sublease income	(3)	(11)
Total lease cost	$ 438	886
Operating cash flows from operating leases		(805)
Right-of-use assets obtained in exchange for new operating lease obligations		$ 7,785	[1]
Weighted-average remaining lease term - operating leases (in years) (Year)	7 years 146 days	7 years 146 days
Weighted-average discount rate - operating leases	6.20%	6.20%

[1] Includes $7.7 million recorded at the date of implementation of ASC 842 on January 1, 2019.