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, 2015	Dec. 31, 2014	Dec. 31, 2013
Expected federal income tax benefit at 34%	$ (8,163)	$ (6,418)	$ (7,698)
Loss with no tax benefit provided	7,389	5,766	7,108
State income tax	4	4	6
Non-deductible expenses and other	774	652	590
Income tax expense	$ 4	$ 4	$ 6