Note 7 - A Reconciliation of the Income Tax Benefit to the Statutory Federal Income Tax Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Expected federal income tax benefit at 34%	$ (8,955)	$ (8,163)	$ (6,418)
Loss with no tax benefit provided	6,918	7,389	5,766
State income tax	4	4	4
Non-deductible expenses and other	2,037	774	652
Income tax expense	$ 4	$ 4	$ 4