Note 5 - Accrued Liabilities - Accrued Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Payroll, bonus, and benefits	$ 1,204	$ 317
Legal and consulting	550	167
Stock-based compensation	71	171
Litigation settlement		3,000
Other accrued expenses	456	298
Total accrued liabilities	$ 2,281	$ 3,953