Note 6 - Leases - Operating Leases Balance Sheet Information (Details) - USD ($) $ in Thousands		Sep. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Other noncurrent assets	[1]	$ 1,177
Accrued and other current liabilities		463
Noncurrent operating lease liabilities		714	$ 595	$ 0
Total liabilities		$ 1,177

[1] Operating lease assets balance at September 30, 2019.