Note 5 - Leases - Leases Cost (Details) - USD ($) $ in Thousands		3 Months Ended
	Jan. 01, 2019	Mar. 31, 2020		Mar. 31, 2019		Dec. 31, 2019
Operating lease costs		$ 366		$ 305
Short-term and other lease costs		77		98
Total lease costs		443		403
Operating cash flows from operating leases		373		304
ROU assets obtained in exchange for new operating lease liabilities (1)	$ 2,200	$ 277	[1]	$ 2,264	[1]
Weighted-average remaining lease term (in years) (Year)		2 years 2 months 12 days				2 years 1 month 6 days
Weighted-average discount rate		3.60%				3.70%

[1] For the three months ended March 31, 2019, the amount includes $2.2 million for operating leases existing on January 1, 2019.