Note 7 - Income Taxes (Details Textual) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Mar. 31, 2017
Income Tax Expense (Benefit)	$ 0	$ 0
Accounting Standards Update 2016-09 [Member]
Deferred Tax Assets, Operating Loss Carryforwards	600		$ 600
Deferred Tax Assets, Valuation Allowance	$ 600