Note 2 - Adoption of New Accounting Standard (Details Textual) - USD ($) $ in Thousands		Jun. 30, 2019	Jan. 01, 2019
Operating Lease, Right-of-Use Asset	[1]	$ 1,004
Operating Lease, Liability, Total		$ 1,004
Accounting Standards Update 2016-02 [Member]
Operating Lease, Right-of-Use Asset			$ 1,100

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