Note 6 - Leases - Leases Cost (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	Jan. 01, 2019	Jun. 30, 2019		Jun. 30, 2019
Operating lease costs		$ 332		$ 637
Short-term lease costs		84		182
Total lease costs		416		819
Operating cash flows from operating leases		423		727
ROU assets obtained in exchange for operating lease liabilities (1)	$ 2,200	$ 317	[1]	$ 2,581	[1]
Weighted-average remaining lease term (in years) (Year)		2 years 2 months 12 days		2 years 2 months 12 days
Weighted-average discount rate		4.20%		4.20%

[1] For the six months ended June 30, 2019, the amount includes $2.2 million for operating leases existing on January 1, 2019.