Note 6 - Leases - Leases Cost (Details) - USD ($) $ in Thousands		3 Months Ended
	Jan. 01, 2019	Mar. 31, 2019	Mar. 31, 2019
Operating lease costs			$ 305
Short-term lease costs			98
Total lease costs			403
Operating cash flows from operating leases			304
ROU assets obtained in exchange for operating lease liabilities (1)	$ 2,200	$ 100	$ 2,264	[1]
Weighted-average remaining lease term (Year)		2 years 109 days	2 years 109 days
Weighted-average discount rate		4.10%	4.10%

[1] Includes $2.2 million for operating leases existing on January 1, 2019 and $0.1 million for new operating leases commenced during the three months ended March 31, 2019.