Note 7 - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Income Tax Expense (Benefit)	$ 0	$ 0
Accounting Standards Update 2016-09 [Member]
Deferred Tax Assets, Operating Loss Carryforwards	600
Deferred Tax Assets, Valuation Allowance	$ 600