Note 5 - Leases - Lease Information (Details) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Right-of-use operating lease assets, net	$ 941,000
Current lease liability	94,000
Non-current lease liability	$ 854,000
Weighted average remaining lease term (Year)	5 years 73 days
Discount rate	22.00%