Note 9 - Stock Options - Outstanding (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Number of outstanding options (in thousands) (in shares)	2,254
Number of outstanding options (in thousands) (in shares)	2,079	2,287
Weighted average remaining contractual life (Year)	3 years 25 days
Weighted average remaining contractual life (Year)	2 years 251 days
Weighted average exercise price per share (in dollars per share)	$ 0.64
Weighted average exercise price per share (in dollars per share)	$ 0.59	$ 0.51
Intrinsic value (in thousands)	$ 121
Intrinsic value (in thousands)	$ 116